Spectra HR320 User manual

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

Introduction
Thank you for choosing the Spectra Precision® Laser HR320 from the
family of precision products. The HR320 is a battery-operated laser
receiver that detects a rotating laser beam and indicates its position
relative to the beam using LCD symbols.
Before using the receiver, be sure to read this user guide carefully.
Included in it is information about setting up, using, and maintaining the
receiver. Also included in this manual are CAUTIONS and Notes. Each of
these words represents a level
of danger or concern. A CAUTION indicates a hazard or unsafe practice
that could result in minor injury or property damage.
A Note indicates important information unrelated to safety.
Your comments and suggestions are welcome; please contact us at:
Spectra Precision LLC
3265 Logistics Lane, Suite 200
Dayton, Ohio 45377 U.S.A.
Phone: [phone]
Internet: www.spectraprecision.com
How to Use the Receiver
Installing/Removing the Batteries
7. Clamp-Tab Recess—the
general-purpose clamp
release tab fits into this area
locking the clamp in place.
8. Clamp Slots—allows the clip-
on general-purpose clamp to
attach to receiver.
9. Battery Housing—holds two
AA alkaline, Ni-MH,
or Ni-Cd batteries.
10. Battery Door—holds the
batteries securely in place.
11. Label—shows the serial
number and manufacturing
date.
Receiver
Features and Functions
1. Power/Audio Button—is a
multi-functional button that is
used to turn on/off the receiver
and adjust the volume.
2. Grade-Sensitivity Button—
allows you to select
the receiver’s on-grade
sensitivities, which include
fine: 2.0 mm (1/16 in.) and
coarse: 6.0 mm (1/4in.).
3. Liquid Crystal Display
(LCD)—shows the elevation,
grade sensitivity, audio,
1. Open the battery door using a coin or your thumbnail.
2. Install/Remove the 2 AA batteries noting the positive (+) and negative
(–) diagram inside the housing.
3. Push down on the battery door until it “clicks” into position.
Learning the Receiver Functions
Turning On/Off the Receiver
1. Press the power/audio
button to turn on the
receiver.
Note: When the
receiver is initially
turned on, all LCD
symbols, and the
audio signal are turned
on for one second
(diagnostic mode). After
the diagnostic mode is
complete, the grade sensitivity (fine) and the audio (loud) symbols
appear.
2. Press and hold the power/audio button for one second to turn off the
receiver.
Selecting the Audio Function
The receiver always starts up with the audio mode (loud) active.
1. Press the power/audio button repeatedly to cycle through the audio
levels, which include loud, off, and soft.
Note: If the audio function is on, the receiver beeps quickly when
the receiver is above the laser beam, slowly when below it, and
continuously when centered in the laser beam or on grade.When
audio is off, a single beep indicates laser is detected.
HR320 Receiver
User Guide
•
Selecting the Grade Sensitivity
The receiver always starts up with the on-grade sensitivity (fine) active.
1. Press the grade-sensitivity button repeatedly to select between fine:
2.0 mm (1/16 in.) and coarse: 6.0 mm (1/4in.) grade sensitivity.
Using the Receiver with a Laser
1. Press the power/audio button to turn on the receiver.
2. Position the receiver so that its photocell faces the laser.
3. Move the receiver up/down until the LCD show an on-grade reading.
LCD/Audio Information
LCD Readout Function Audio Output
Down arrow High Fast beeping tone
Center bar &
down arrow Fine-high Fast beeping tone
Center bar On-grade Continuous tone
Center bar &
up arrow Fine-low Slow beeping tone
Up arrow Low Slow beeping tone
Battery Full battery NA
Battery Low battery N/A
Horn Audio on/soft/loud Single beep
Fine Fine grade sensitivity N/A
Coarse Coarse grade sensitivity N/A
– 5 – – 6 – – 7– – 8–
– 2 – – 3– –4 –
and battery status.
4. Photocell—detects the laser beam when it strikes the receiver.
5. Marking Notch—align with the on-grade portion of the photocell and
is used to mark elevation readings. The marking notch is 50.0 mm (2
in.) from the top of the receiver.
6. Audio Port—the sound comes out of this opening.
2
1
4
5
3
www.spectraprecision.com
Above Grade
Audio On
On Grade
Battery Status
Below Grade
Grade Sensitivity
7
8
9
10
11
6

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.

General-Purpose Clamp
The C59 general-purpose clamp allows the receiver to be attached to a
grade rod or wooden pole.
Features and Functions
Attaching the Receiver to the Grade Rod or Wooden Pole
Declaration of Conformity
Application of 89/336/EEC
Council Directive(s):
Manufacturer’s Name: Spectra Precision (USA) LLC
Manufacturer’s Address: 3333 Warrenville Rd. Unit 200
Lisle, IL 60532 U.S.A
European Representative Spectra Precision (Kaiserslautern) GmbH
Address: Am Sportplatz 5
67661 Kaiserslautern, Germany
Model Number: HR320
Conformance to Directive(s): EC Directive 89/336/EEC using
EN55022 and EN50082-1
Equipment Type/Environment: ITE/residential, commercial & light
industrial
Product Standards: Product meets the limit B and
methods of EN55022
Product meets the levels and
methods of IEC 801-2, 8 kV air, 4 kV
contact IEC 801-3, 3 V/m 26 to 1000
MHz 80%, @ 1 kHz
Warranty
Spectra Precision LLC warrants the receiver to be free of defects in
material and workmanship for a period of three years.
Spectra Precision LLC or its authorized service center will repair or
replace, at its option, any defective part for which notice has been given
during the warranty period. If required, travel and per diem expenses
to and from the place where repairs are made will be charged to the
customer at the prevailing rates.
Customers should send the product to the nearest authorized service
center for warranty repairs, freight prepaid. In countries with Spectra
Precision LLC subsidiary service centers, the repaired product will be
returned to the customer, freight prepaid.
Any evidence of negligent, abnormal use, accident, or any attempt
to repair the product by other than factory-authorized personnel using
Spectra Precision LLC certified or recommended parts, automatically
voids the warranty.
The foregoing states the entire liability of Spectra Precision LLC regarding
the purchase and use of its equipment. Spectra Precision LLC will not be
held responsible for any consequential loss or damage of any kind.
This warranty is in lieu of all other warranties, except as set forth above,
including any implied warranty merchantability of fitness for a particular
purpose, are hereby disclaimed. This warranty is in lieu of all other
warranties, expressed or implied.
EMC Declaration of Conformity
This receiver has been tested and found to comply with the limits
for a Class B digital device for radio noise for digital apparatus
set out in the Radio Interference Regulations of the Canadian Department
of Communication, and is pursuant to part 15 of
the Federal Communication Commission (FCC) rules. These
limits are designed to provide reasonable protection against harmful
interference in a residential installation. This receiver generates radio
frequency. If it’s not used in accordance with the instructions, it may
cause harmful interference to radio or television reception. Such
interference can be determined by turning the receiver off and on. You
are encouraged to try eliminating the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the laser and the receiver.
For more information, consult your dealer or an experience radio/
television technician.
CAUTION: Changes or modifications to the receiver that are
not expressly approved by Spectra Precision LLC could void authority to
use the equipment.
Receiver Specifications
LCD Channels 5
Capture Height 50.0 mm (2 in.)
Acceptance Angle 90°
On-Grade Sensitivity Fine: 2.0 mm (1/16 in.)
Coarse: 6.0 mm (1/4 in.)
Power Source Two 1.5-V batteries
(type LR6/AA)
Battery Life @ 20 °C (68 °F) Alkaline: 70 hours
Battery Indicator LCD battery symbol
Beeper volumes High: 100+ dBA
Low: 75 to 85 dBA
Automatic Shutoff 30 minutes after last laser detection or
push-button actuation
Spectral Sensitivity Operates with red visible and infrared
rotating lasers with wavelengths between
610 and 900 nm
Marking Notch 50.0 mm (2 in.) below top of receiver
Operating Temperature –20 °C to +60 °C (–4 °F to +140 °F)
Storage Temperature –40 °C to +70 °C (–40 °F to +158 °F)
Weight 0.3 kg (12 oz)
Dimensions (H x W x D) 16.3 cm x 7.4 cm x 2.9 cm
(6.4 in. x 2.9 in x 1.14 in . )
1. Release Tab—allows the receiver to be locked onto or released from
the general-purpose clamp.
2. Jaws—close/open so that the general-purpose clamp can be
attached to or released from a grade rod or wooden pole.
3. Jaws Screw—controls the closing/opening of the jaws.
4. Reading Edge—aligns with the receiver’s on-grade marking notch.
5. Bubble Screw Holes—are where the optional 1277-6251S bubble
vial kit is mounted.
1. Slide the general-purpose
clamp into the receiver until
it “clicks” into position.
2. Turn the jaws screw
counterclockwise to open
the clamp’s jaws.
3. Slide the grade rod or
wooden pole between the
clamp’s jaws.
4. Turn the jaws screw
clockwise to hold the
general-purpose clamp
securely in place.
– 13 – – 14 – – 15 –
– 9 – – 10 – – 11 – – 12 –
© 2023, Spectra Precision LLC. All rights reserved.
Reorder PN 1277-4450 Rev B (05/23)
2
1
3
4
5
Spectra Precision (USA) LLC
3265 Logistics Lane, Suite 200
Dayton, OH 45377 USA
888-527-3771 (Toll Free)
www.spectraprecision.com
Spectra Precision
(Kaiserslautern) GmbH
Am Sportplatz 5
67661 Kaiserslautern
Germany
[phone] Phone
Protecting the Environment
The unit, accessories and packaging ought to be recycled.
All plastic parts are marked for recycling according to material type.
Do not throw used batteries into the garbage, water or fire.
Remove them in compliance with environmental requirements.