Anaheim Scientific M120 User manual

Model M120
Mini Tempe ratu re/H umi dity M eter

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Table of Contents
1INTRODUCTION............................................................................... 3
1.1 The M120 features: .................................................................... 3
2SAFETY SUMMARY......................................................................... 4
3COMPLIANCE STATEMENTS......................................................... 5
4PRODUCT CONTENTS AND INSPECTION .................................... 5
5DEVICE DESCRIPTION ................................................................... 7
5.1 Meter Control Buttons ................................................................ 7
5.2 LCD Display Functions............................................................... 8
6DEVICE OPERATION....................................................................... 8
6.1 Switching Mode.......................................................................... 8
6.2 CAL/°C/°F Button: ...................................................................... 8
6.3 MAX/MIN/AVG Button:............................................................... 9
6.4 Data Hold Button:....................................................................... 9
6.5 Power Button:........................................................................... 10
6.6 Auto Power-Off:........................................................................ 10
6.7 Battery Replacement:............................................................... 11
7TECHNICAL SPECIFICATIONS .................................................... 12
8SERVICE, REPAIRS, CALIBRATION............................................ 13
9LIMITED TWO-YEAR WARRANTY ............................................... 15

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1 Introduction
Thank you for purchasing a M120
Tempera t u re/Humid i ty Meter from Anaheim Scientific.
The M120 uses a highly accurate sensor chip to
measure relative humidity and temperature. It is
perfect for many industrial applications, laboratory and
other types of work environments. Durable and reliable
the M120 is easy to use.
1.1 The M120 features:
•Dual display of temperature and humidity
•°C / °F modes
•Simultaneously hold both temperature and humidity
readings
•Simultaneously hold both maximum and minimum
and average readings (MAX/MIN/AVG)
•Auto-power off
•Low battery indicator
•DEW-POINT and WET-BULB temperature
measurements

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2 Safety Summary
CAUTION
Adhere to the following conditions for safe
and effective usage of this meter
•Do not operate the meter in an environment filled
with combustible gas, liquids, dust or fibers
•In order to avoid reading incorrect data, please
replace the battery immediately when the symbol
“" appears on the LCD
•When not using the Temperature / Humidity Meter
for an extended period of time, remove the battery
to avoid damage to the thermometer due to the
leaking battery fluid.
•Operating Environment: 0°C ~ +60°C, <95% RH.
(non-condensing)
•Storage Environment: -10°C ~ +60°C, <70% RH.
(non-condensing)
•Cleaning and Maintenance : Cigarette ashes and
dust on the humidity sensor can slow down the
sensor’s response time, while causing inaccuracy
in measurements. Clean up the sensor periodically
by simply blowing away the dust particles. Do not
apply water or other chemical solvent like alcohol
when cleaning.
•Do not place the Temperature / Humidity Meter
inside any liquid to prevent damage to the
Thermometer.

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3 Compliance Statements
Caution: This symbol indicates that the
equipment and its accessories shall be
subject to separate collection and disposal
procedures
EMC
-EMC : EN61326-1
This product complies with requirements of the
following European Community Directives:
89/336/EEC (Electromagnetic Compatibility) and
73/23/EEC (Low Voltage) as amended by 93/68/EEC
(CE Marking). However, electrical noise or intense
electromagnetic fields in the vicinity of the equipment
may disturb the measurement circuit. Measuring
instruments will also respond to unwanted signals that
may be present within the measurement circuit. Users
should exercise care and take appropriate precautions
to avoid misleading results when making
measurements in the presence of electronic
interference.
4 Product Contents and Inspection
This unit is tested prior to shipment. It is therefore
ready for immediate use upon receipt. An initial

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physical inspection should be made to ensure that no
damage has been sustained during shipment.
Inspect the packing box on receipt for any external
damage. If any external damage is evident, remove
the instrument and visually inspect its case and parts
for any damage. If damage to the instrument is
evident, a description of the damage should be noted
on the carrier’s receipt and signed by the driver or
carrier agent. Save all shipping packaging for
inspection. Forward a report of any damage to the
agent through which the unit is procured.
Retain the original packing in case subsequent
repackaging for return is required. Use of the original
packing is essential.
After the mechanical inspection, verify the contents of
the shipment. The items included in this package are:
•M120 Meter
•User Manual
•Carrying Case
•2 x AAABatteries

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5 Device Description
5.1 Meter Control Buttons
1. Sensor
2. LCD
3. °C/°F Tem p er a t ure u n it an d
calibration button
4. DEW-POINT/WET-
BULB/Temperature button
5. MAX/MIN/AVG Reading
button
6. Data hold button
7. On/Off button

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5.2 LCD Display Functions
1. Low Battery Detect
2. Primary Display
3. Secondary Display
4. Auto-Power Off
Indicator
5. Data Hold
6. MAX Data Hold
7. AVG Reading
8. MIN Data Hold
9. Relative Humidity
10. °C Tem p er a t ure u n it
11. DEW-POINT
12. WET-BULB
13. °F Tem p ert u re un i t
6 Device Operation
6.1 Switching Mode
During normal measurement, press “MODE”button to
switch temperatureDew-pointWet-bulb in
sequence.
6.2 CAL/°C/°F Button:
•Calibration point 55%RH and 25℃
1. Prepare the 55%RH and 25℃environment
2. Press CAL button and POWER button for more
than 2 seconds to calibrate

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3. Put the meter in the calibration environment
4. Presses the MODE key to select humidity or
temperature (humidity and temperature must be
done individually)
5. Press CAL button more than 2 second to
complete the adjustment.
6. To exit calibration mode, press the ” ” key.
•Press this button to alternate between °C and °F
units.
6.3 MAX/MIN/AVG Button:
The MAX/MIN feature reads and updates the display
to show the maximum or minimum or AVG value
measured after you press the MAX/MIN button.
Pressing the MAX/MIN button for less than 1 second
will put the meter into a mode of displaying the
maximum, minimum, average readings. Each time the
MAX button is pressed, the meter will cycle between
MAX and MIN and AVG readings. Press the MAX/MIN
button for more than 2 seconds to exit this mode.
6.4 Data Hold Button:
Press the “HOLD” button to enter the Data Hold mode.
The LCD will display the “HOLD” symbol and hold both
the temperature and humidity readings at the same
time. Press the ”HOLD “ button again to exit this
mode.

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6.5 Power Button:
Press the ”” button more than 2 secondsto power
on the meter.
6.6 Auto Power-Off:
To s ave battery life, the meter powers down
automatically after approximately 12minutes of
inactivity. Yo u c an disable or enable Auto Power-Off by
pressing the ” ” button more than 2 second the LCD
“” symbol will disappear or appear.

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6.7 Battery Replacement:
WARNING
If the symbol ” ” appears on the LCD, please
replace the battery immediately
•Remove the battery cover
•Replace the battery.
•Install the battery cover.

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7 Technical Specifications
Display
Dual LCD display. The maximum value
on the primary display is 999. The
maximum value on secondary display is
999.
Sampling
Rate
1 sample per second
Measuring
Range
-20.0°C ~ +50.0°C (-4.0°F ~+122.0°F)
1.0% ~ 99%RH
Accuracy
Humidity : ±3.5% for 20~90%
± 5% for 1~19.9 and 90.1~99
Te mperature : ±1.0℃, ±1.8℉
Power
Supply
2 AAA Batteries
Battery life
50 hours during consecutive use
Dimensions
107 ×48 ×23 mm (H ×W ×D)
Weight
80g (excluding the battery)
Warranty
Limited two-year warranty
Validity
Above specifications tested at:
Tempera t u re: 25°C, Hu m i d ity: <90 % RH )

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8 Service, Repairs, Calibration
•The following are instructions regarding policies for
servicing, repairing or calibrating Anaheim Scientific
products. Turnaround time is usually less than ten
(10) working days unless expeditedservice is
requested and pre-arranged.
•Send an email to servi[email protected]
requesting an RMA number specifying your request
for either service/repair and/or calibration with your
product’s model number.
•Once you receive a reply from
[email protected], you will be asked
to ship prepaid to the address below. Package the
unit carefully using filler or bubble wrap, and if
possible, ship in the original box. Ship each unit
separately. (Anaheim Scientific is not responsible
for any shipping damage that may occur.)
•Include a packing list with each unit shipped stating
what type of service is required and include the
return shipping information: name, address and
telephone number.
•If the unit is in warranty, please provide the
following: proof of purchase or copy of the original
invoice.
•If the unit is out of warranty, prepayment is required
by Check, Money Order or Credit Card.
•Return all merchandise to Anaheim Scientific with
pre-paid shipping. The flat-rate repair charge for
Non-Warranty Service does not include return

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shipping. Return shipping to locations in North
American is included for Warranty Service.
•For overnight shipments and non-North American
shipping fees please contact Anaheim Scientific
Anaheim Scientific
ATTN: Service/Repair
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.anaheimscientific.com

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9 Limited Two-Year Warranty
•Scientific warrants to the original purchaser that its
products and the component parts thereof, will be
free from defects in workmanship and materials for
a period of two years from date of purchase.
•Anaheim Scientific will, without charge, repair or
replace, at its option, defective product or
component parts. Returned product must be
accompanied by proof of the purchase date in the
form of a sales receipt.
•To help u s b e t ter se r v e y ou, ple a s e c o m p lete t h e
warranty registration for your new instrument via
our website www.anaheimscientific.com
•Exclusions: This warranty does not apply in the
event of misuse or abuse of the product or as a
result of unauthorized alterations or repairs. The
warranty is void if the serial number is altered,
defaced or removed.
•Anaheim Scientific shall not be liable for any
consequential damages, including without limitation
damages resulting from loss of use. Some states
do not allow limitations of incidental or
consequential damages. So the above limitation or
exclusion may not apply to you.
•This warranty gives you specific rights and you may
have other rights, which vary from state-to-state.

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22820 Savi Ranch Parkway
Yo r b a Linda, CA 92887
www.anaheimscientific.com
© 2013 Anaheim Scientific