Extech Instruments EX570 User manual

User's Guide
True RMS Multimeter with
IR Thermometer
Extech EX570
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Introduction
Congratulations on your purchase of the Extech EX570 True RMS Autoranging Multimeter.
This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance, Frequency,
Duty Cycle, Diode Test, and Continuity plus Thermocouple Temperature and InfraRed
Temperature. It features a waterproof, rugged design for heavy duty use. Proper use and
care of this meter will provide many years of reliable service.
Safety
This symbol adjacent to another symbol, terminal or operating device
indicates that the operator must refer to an explanation in the Operating
Instructions to avoid personal injury or damage to the meter.
This WARNING symbol indicates a potentially hazardous situation, which
if not avoided, could result in death or serious injury.
This CAUTION symbol indicates a potentially hazardous situation, which
if not avoided, may result damage to the product.
This symbol advises the user that the terminal(s) so marked must not be
connected to a circuit point at which the voltage with respect to earth
ground exceeds (in this case) 1000 VAC or VDC.
This symbol adjacent to one or more terminals identifies them as being
associated with ranges that may, in normal use, be subjected to
particularly hazardous voltages. For maximum safety, the meter and its
test leads should not be handled when these terminals are energized.
This symbol indicates that a device is protected throughout by double
insulation or reinforced insulation.
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for connection to circuits in
which measures are taken to limit the transient overvoltages to an appropriate low level.
Note – Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming equipment to be
supplied from the fixed installation.
Note – Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed installations.
Note – Examples include switches in the fixed installation and some equipment for
industrial use with permanent connection to the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of the installation.
Note – Examples include electricity meters and primary over-current protection equipment
WARNING
CAUTION
MAX
1000V
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CAUTIONS
•Improper use of this meter can cause damage, shock, injury or death. Read and
understand this user manual before operating the meter.
•Always remove the test leads before replacing the battery or fuses.
•Inspect the condition of the test leads and the meter itself for any damage before
operating the meter.
•Use great care when making measurements if the voltages are greater than 25 VAC
rms or 35 VDC. These voltages are considered a shock hazard.
•Warning! This is a class A equipment. This equipment can cause interferences in the
living quarters; in this case the operator can be required to carry out adequate
measures.
•Always discharge capacitors and remove power from the device under test before
performing Diode, Resistance or Continuity tests.
•Voltage checks on electrical outlets can be difficult and misleading because of the
uncertainty of connection to the recessed electrical contacts. Other means should be
used to ensure that the terminals are not "live".
•If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
•This device is not a toy and must not reach children’s hands. It contains hazardous
objects as well as small parts that the children could swallow. In case a child
swallows any of them, please contact a physician immediately
•Do not leave batteries and packing material lying around unattended; they can be
dangerous for children if they use them as toys
•In case the device is going to be unused for an extended period of time, remove the
batteries to prevent them from draining
•Expired or damaged batteries can cause cauterization on contact with the skin.
Always, therefore, use suitable hand gloves in such cases
•See that the batteries are not short-circuited. Do not throw batteries into the fire.
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SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated with caution. The rules
listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specified maximum:
Input Protection Limits
Function Maximum Input
V DC or V AC 1000 VDC/AC rms
mA AC/DC 500 mA 1000V fast acting fuse
A AC/DC 10A 1000V fast acting fuse (20A for 30 seconds
max every 15 minutes)
Frequency, Resistance, Capacitance,
Duty Cycle, Diode Test, Continuity 1000 VDC/AC rms
Temperature 1000 VDC/AC rms
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack exceeds 600V above
earth ground.
4. NEVER connect the meter leads across a voltage source while the function switch is in
the current, resistance, or diode mode. Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and disconnect the power when
making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before opening the covers to
replace the fuse or batteries.
7. NEVER operate the meter unless the back cover and the battery and fuse covers are in
place and fastened securely.
8. If the equipment is used in a manner not specified by the manufacturer, the protection
provided by the equipment may be impaired.
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Controls and Jacks
1. IR Thermometer
2. Laser Pointer
3. 40,000 count LCD
4. MAX/MIN button
5. MEMORY button
6. SELECT button
7. Function switch
8. mA, µA and 10A input jacks
9. PEAK and RELATIVE button
10. RANGE button
11. HOLD and (Backlight) button
12. IR Thermometer button
13. Positive input jack
14. COM input jack
Note: Tilt stand and battery compartment are on rear of unit.
Symbols and Enunciators
•))) Continuity
Diode test
+Low Battery
MEM Memory
n nano (10-9) (capacitance)
µ micro (10-6) (amps, cap)
m milli (10-3) (volts, amps)
A Amps
k kilo (103) (ohms)
F Farads (capacitance)
M mega (106) (ohms) APO Auto Power Off
Ω Ohms P Peak
Hz Hertz (frequency) V Volts
% Percent (duty ratio) REL Relative
AC Alternating current AUTO Autoranging
DC Direct current HOLD Display hold
ºF Degrees Fahrenheit ºC Degrees Centigrade
MAX Maximum MIN Minimum
12
3
4
5
6
7
8
9
10
11
12
13
14
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Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very
dangerous and should be measured with great care.
1. ALWAYS turn the function switch to the OFF position when the meter is not in use.
2. If “OL” appears in the display during a measurement, the value exceeds the range you
have selected. Change to a higher range.
AC/DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or
OFF. Large voltage surges may occur that can damage the meter.
1. Rotate the function switch to the Vposition.
2. Press the SELECT button to display “DC” or “AC” on the LCD
3. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
4. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
5. Read the voltage in the display.
DC/AC MILLIVOLT MEASUREMENTS
CAUTION: Do not measure DC/AC voltages if a motor on the circuit is being switched
ON or OFF. Large voltage surges may occur that can damage the meter.
1. Rotate the function switch to the mV DC-AC position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
3. Press the SELECT button to select “DC” or “AC” millivolts.
4. Touch the black test probe tip to the negative side of the circuit.
Touch the red test probe tip to the positive side of the circuit.
5. Read the voltage in the display.
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AC/DC CURRENT MEASUREMENTS
CAUTION: Do not make 20A current measurements for longer than 30 seconds.
Exceeding 30 seconds may cause damage to the meter and/or the test leads.
1. Insert black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA DC, set the function switch to
the µA position and insert the red test lead banana plug into the µA/mA
jack.
3. For current measurements up to 400 mA DC, set the function switch to
the mA position and insert the red test lead banana plug into the
µA/mA jack.
4. For current measurements up to 20A DC, set the function switch to the
10A/HZ/% position and insert the red test lead banana plug into the
10A jack.
5. Press the SELECT button to indicate “DC” or “AC” on the display.
6. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
7. Touch the black test probe tip to the negative side of the circuit. Touch
the red test probe tip to the positive side of the circuit.
8. Apply power to the circuit.
9. Read the current in the display.
RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and
discharge all capacitors before taking any resistance measurements. Remove the
batteries and unplug the line cords.
1. Rotate the function switch to the Ωposition.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Ωjack.
3. Press the SELECT button to indicate “Ω” on the display.
4. Touch the test probe tips across the circuit or part under test. It is best
to disconnect one side of the part under test so the rest of the circuit
will not interfere with the resistance reading.
5. Read the resistance in the display.
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CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on circuits or wires that
have voltage on them.
1. Rotate the function switch to the Ωposition.
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Ωjack.
3. Press the SELECT button to indicate“ "on the display
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than approximately 35Ω, the audible signal
will sound. If the circuit is open, the display will indicate “OL”.
DIODE TEST
1. Rotate the function switch to the green Ωposition.
2. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive Vjack.
3. Press the SELECT button to indicate “ “ and “V” on the display.
4. Touch the test probes to the diode under test. Forward voltage will
typically indicate 0.400 to 0.700V. Reverse voltage will indicate “OL”.
Shorted devices will indicate near 0V and an open device will
indicate “OL” in both polarities.
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NON-CONTACT INFRARED TEMPERATURE MEASUREMENTS
1. Rotate the function switch to the IR position.
2. Press the SELECT button to select °F or °C.
3. Aim the infrared sensor (top of meter) at the surface to be measured.
4. Press the IRT button to turn on the IR thermometer and laser pointer. The laser
pointer identifies the surface spot to be measured.
5. The area of the surface to be measured must be larger than the spot size as
determined by the distance to spot size specification.
6. Read the temperature in the display. When the IRT button is released the displayed
temperature will be held for approximately 10 seconds.
WARNING: Do not directly view or direct the laser pointer at an eye. Low power
visible lasers do not normally present a hazard, but may present some potential for hazard
if viewed directly for extended periods of time.
IR Spot to Distance Diagram
The 30:1 spot to distance ratio determines the size of the measured surface area with
respect to the distance the meter is held away from the surface.
IR Measurement Notes
1. The object under test should be larger than the spot (target) size calculated by the
field of view diagram.
2. If the surface of the object under test is covered with frost, oil, grime, etc., clean
before taking measurements.
3. If an object's surface is highly reflective, apply masking tape or flat black paint to the
surface before measuring.
4. The meter will not make measurements through glass.
5. Steam, dust, smoke, etc. can obscure measurements.
6. To find a hot spot, aim the meter outside the area of interest then scan across (in an
up and down motion) until the hot spot is located.
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THERMOCOUPLE TEMPERATURE MEASUREMENTS
1. Rotate the function switch to the TYPE K position.
2. Insert the Temperature Probe into the input jacks, making sure to
observe the correct polarity.
3. Press the SELECT button to indicate “ºF” or “ºC”
4. Touch the Temperature Probe head to the part whose temperature
you wish to measure. Keep the probe touching the part under test
until the reading stabilizes.
5. Read the temperature in the display.
Note: The temperature probe is fitted with a type K mini connector.
A mini connector to banana connector adaptor is supplied for
connection to the input banana jacks.
Note: The temperature range of the supplied thermocouple probe is -20 to 250°C (-4 to
482°F)
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit under test and
discharge all capacitors before taking any capacitance measurements. Remove the
batteries and unplug the line cords.
1. Rotate the function switch to the CAP position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
3. Touch the test leads to the capacitor to be tested.
4. Read the capacitance value in the display
FREQUENCY (DUTY CYCLE) MEASUREMENTS
1. Rotate t the function switch to the Hz/% position.
2. Insert the black lead banana plug into the negative COM jack and
the red test lead banana plug into the positive Hz jack.
3. Touch the test probe tips to the circuit under test.
4. Read the frequency on the display.
5. Press the SELECT button to indicate “%”.
6. Read the % duty cycle in the display.
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MEMORY
The meter can store and recall up to 3 readings.
Storing readings:
1. Press and Hold the MEM button until “MEM1” (with a flashing 1) appears in the
display. Memory 1 is ready to accept data.
2. Press and release the MEM button to step through and select memories 2 or 3.
3. Press and Hold the MEM button to store the displayed value into the memory
selected.
4. After storing the reading, the meter will return to normal operation.
Recalling readings:
1. Press and release the MEM button. “MEM1” and the stored value will appear in the
display.
2. Press and release the MEM again button to step through and view memories 2 and 3.
3. Press and release the MEM again button to return to normal operation.
AUTORANGING/MANUAL RANGE SELECTION
When the meter is first turned on, it automatically goes into AutoRanging. This
automatically selects the best range for the measurements being made and is generally
the best mode for most measurements. For measurement situations requiring that a range
be manually selected, perform the following:
1. Press the RANGE key. The “AUTO” display indicator will turn off.
2. Press the RANGE key to step through the available ranges until you select the range
you want.
3. To exit the Manual Ranging mode and return to Autoranging, press and hold the
RANGE key for 2 seconds.
Note: Manual ranging does not apply for the Temperature functions.
MAX/MIN
1. Press the MAX/MIN key to activate the MAX/MIN recording mode. The display icon
"MAX" will appear. The meter will display and hold the maximum reading and will update
only when a new “max” occurs.
2. Press the MAX/MIN key again and the display icon "MIN" will appear. The meter will
display and hold the minimum reading and will update only when a new “min” occurs.
3. To exit MAX/MIN mode press and hold the MAX/MIN key for 2 seconds.
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Relative mode
The relative measurement feature allows you to make measurements relative to a stored
reference value. A reference voltage, current, etc. can be stored and measurements made
in comparison to that value. The displayed value is the difference between the reference
value and the measured value.
1. Perform the measurement as described in the operating instructions.
2. Press and Hold the REL button to store the reading in the display and the "REL"
indicator will appear on the display.
3. The display will now indicate the difference between the stored value and the measured
value.
4. Press and Hold the REL button to exit the relative mode.
PEAK HOLD
The Peak Hold function captures the peak AC voltage or current. The meter can capture
negative or positive peaks as fast as 1 millisecond in duration. Press the PEAK button.
“PMAX” will appear in the display. The meter will update the display each time a higher
positive peak occurs. Press the PEAK button again to exit the mode.
DISPLAY BACKLIGHT
Press the HOLD/ key for >1 second to turn the backlight on. The backlight will
automatically turn off after 10 seconds.
HOLD
The hold function freezes the reading in the display. Press the HOLD key momentarily to
activate or to exit the HOLD function.
LOW BATTERY INDICATION
When the low battery
+
icon appears in the display, the battery should be replaced.
AUTO POWER OFF
The auto off feature will turn the meter off after 15 minutes. To disable the auto power off
feature, hold down the SELECT button and turn the meter on. “APO d” will appear in the
display. Turn the meter off and then on again to re-enable the auto power off feature.
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Maintenance
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing the back cover or the battery or fuse covers.
WARNING: To avoid electric shock, do not operate your meter until the battery and fuse
covers are in place and fastened securely.
This MultiMeter is designed to provide years of dependable service, if the following care
instructions are performed:
1. KEEP THE METER DRY. If it gets wet, wipe it off.
2. USE AND STORE THE METER IN NORMAL TEMPERATURES. Temperature
extremes can shorten the life of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping it can damage the
electronic parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a damp cloth. DO NOT
use chemicals, cleaning solvents, or detergents.
5. USE ONLY FRESH BATTERIES OF THE RECOMMENDED SIZE AND TYPE. Remove
old or weak batteries so they do not leak and damage the unit.
6. IF THE METER IS TO BE STORED FOR A LONG PERIOD OF TIME, the batteries
should be removed to prevent damage to the unit.
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing the battery cover.
1. Turn power off and disconnect the test leads from the meter.
2. Open the rear battery cover by removing two screws (B) using a Phillips head
screwdriver.
3. Insert the battery into battery holder, observing the correct polarity.
4. Put the battery cover back in place. Secure with the screws.
WARNING: To avoid electric shock, do not operate the meter until the battery cover is in
place and fastened securely.
NOTE: If your meter does not work properly, check the fuses and batteries to make sure that
they are still good and that they are properly inserted.
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REPLACING THE FUSES
WARNING: To avoid electric shock, disconnect the test leads from any source of voltage
before removing the meter cover.
1. Disconnect the test leads from the meter.
2. Remove the battery cover (two “B” screws) and the battery.
3. Remove the six “A” screws securing the rear cover.
4. Gently remove the old fuse and install the new fuse into the holder.
5. Always use a fuse of the proper size and value (0.5A/1000V fast blow for the 600 mA
range [SIBA 70-172-40], 10A/1000V fast blow for the 10A range [SIBA 50-199-06]).
6. Replace and secure the rear cover, battery and battery cover.
WARNING: To avoid electric shock, do not operate your meter until the fuse cover is in
place and fastened securely.
AA
A
B
B
F1 F2
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Specifications
Function Range Resolution Accuracy
DC Voltage 400 mV 0.01 mV
±(0.06% reading + 2 digits)
4V 0.0001V
40V 0.001V
400V 0.01V
1000V 0.1V
AC Voltage 40 Hz to 65 Hz 66 Hz to 1000 Hz
400 mV 0.01 mV
±(0.5% rdg + 3 digits) ±(1% rdg + 3 digits)
4 V 0.0001 V
40 V 0.001 V
400 V 0.01 V
1000 V 0.1 V
All AC voltage ranges are specified from 5% of range to 100% of range
DC Current 400 μA 0.01 μA
±(0.7% reading + 3 digits)
4000 μA 0.1 μA
40 mA 0.001 mA
400 mA 0.01 mA ±(1.0% reading + 3 digits)
10 A 0.00 A ±(1.5% reading + 3 digits)
(20 A: 30 sec max with reduced accuracy)
AC Current 40 Hz to 65 Hz 66 Hz to 1000 Hz
400μA 0.01 μA
±(1.0% rdg + 3 digits) ±(1.5% rdg + 3 digits)
4000μA 0.1 μA
40mA 0.001 mA
400mA 0.01 mA
10A 0.001 A
±(2.0% reading + 3
digits)
±(2.0% reading + 3
digits)
(20A: 30 sec max with reduced accuracy)
NOTE: Accuracy is stated at 65oF to 83oF (18oC to 28oC) and less than 75% RH.
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Function Range Resolution Accuracy
Resistance 400 Ω0.01 Ω
±(0.3% reading + 4 digits)
4 kΩ0.0001 kΩ
40 kΩ0.001 kΩ
400 kΩ0.01 kΩ
4 MΩ0.0001 MΩ
40 MΩ0.001 MΩ±(2.0% reading + 20 digits)
Capacitance 40 nF 0.001 nF
±(3.5% reading + 40 digits)
400 nF 0.01 nF
4 µF 0.0001 µF
40 µF 0.001 µF
400 µF 0.01 µF
4000 µF 0.1 µF
±(5% reading + 10 digits)
10000 μF 1 µF
Frequency 40 Hz 0.001 Hz
±(0.1% reading + 1 digits)
400 Hz 0.01 Hz
4 kHz 0.0001 kHz
40 kHz 0.001 kHz
400 kHz 0.01 kHz
4 MHz 0.0001 MHz
40 MHz 0.001 MHz
Duty Cycle 0.1 to 99.90% 0.01% ±(1.0% reading + 2 digits)
Pulse width: 100 µs – 100 ms, Frequency: 5 Hz to 150 kHz
Temperature
(type-K)
-50 to 1382°F 0.1°F ±(1.0% reading + 4.5°F)
±(1.0% reading + 2.5°C)
(probe accuracy not included)
-45 to 750°C 0.1°C
Temperature IR -30 to -6°C
1°C/°F
±4°C
-5 to 100°C ±(1.0%rdg + 2°C)
101 to 550°C ±(2.0%rdg + 2°C)
-22 to 23°F ±8°F
24 to 212°F ±(1.0%rdg + 4°F)
213 to 1022°F ±(2.0%rdg + 4°F)
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Enclosure Double molded, Waterproof (IP64)
Diode Test Test current of 0.9mA maximum, open circuit voltage 2.8V DC
typical
Continuity Check Audible signal will sound if the resistance is less than 35Ω
(approx.), test current <0.35mA
PEAK Captures peaks >1ms
Memory Store and recall up to 3 values
Temperature Sensor Requires type K thermocouple
Input Impedance >10MΩVDC & >3MΩVAC
AC Response True rms
ACV Bandwidth 40Hz to 1000Hz
IR Spectral response 6 to 16µm
IR Emissivity 0.95 fixed
IR distance ratio 30:1
Laser pointer Class 2 laser < 1mW power; Wavelength is 630 to 670nm
Crest Factor ≤3 at full scale up to 500V, decreasing linearly to ≤1.5 at 1000V
Display 40,000 count backlit liquid crystal display with bargraph
Overrange indication “OL” is displayed
Auto Power Off 15 minutes (approximately) with disable feature
Polarity Automatic (no indication for positive); Minus (-) sign for negative
Measurement Rate 2 times per second, nominal
Low Battery Indication “
+
” is displayed if battery voltage drops below operating
voltage
Battery One 9 volt (NEDA 1604) battery
Fuses mA, µA ranges; 0.5A/1000V ceramic fast blow
A range; 10A/1000V ceramic fast blow
Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)
Storage Temperature -4oF to 140oF (-20oC to 60oC)
Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at 104ºF
(40ºC)
Storage Humidity <80%
Operating Altitude 7000 ft. (2000 meters) maximum
Weight 0.753 lb (342 g) (includes holster)
Size 7.36” x 3.2” x 2.0” (187 x 81 x 50 mm) (includes holster)
Safety This meter is intended for origin of installation use and protected,
against the users, by double insulation per EN61010-1 and
IEC61010-1 2nd Edition (2001) to Category IV 600V and Category
III 1000V; Pollution Degree 2.
Approvals CE
Copyright ©2009 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
www.extech.com
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Warranty
EXTECH INSTRUMENTS CORPORATION (a FLIR company) warrants the basic
instrument to be free of defects in parts and workmanship for three years from date of
shipment (a six month limited warranty applies on sensors and cables). If it should become
necessary to return the instrument for service during or beyond the warranty period,
contact the Customer Service Department at [phone] EXTENSION 210 for
authorization or visit www.extech.com for more information. A Return Authorization (RA)
number must be issued before any product is returned to Extech. The sender is
responsible for shipping charges, freight, insurance and proper packaging to prevent
damage in transit. This warranty does not apply to defects resulting from action of the user
such as misuse, improper wiring, operation outside of specification, improper maintenance
or repair, or unauthorized modification. Extech specifically disclaims any implied warranties
or merchantability or fitness for a specific purpose and will not be liable for any direct,
indirect, incidental or consequential
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.

Support line [phone]
Technical support: Extension 200; E-mail: [email protected]m
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA02451
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