User Guide
Dual Moisture Meter
Pin / Pinless Moisture Meter
Model MO260
Introduction
Congratulations on your purchase of the Extech MO260 Moisture Meter. The MO260 detects
moisture in wood and other materials such as particle board, carpeting, and ceiling/bathroom tiles
using the non-invasive method (pinless); the MO260 also measures moisture in sheet rock and
other building materials using the pin method. This meter is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service.
Features
%WME (wood moisture equivalent) pin moisture reading
Relative (REL) pinless moisture reading for non-invasive measurement
Digital LCD readout with backlighting feature and tri-color LED bargraph
Quickly indicates the moisture content of materials
Pinless measurement depth to 0.75" (22mm) below the surface
Electro-magnetic sensing technology for pinless operation
Built-in calibration check and calibration zero
Replaceable measurement electrode pins
Low battery indication
Cap protects pins during storage
Cap can be snapped onto the side of the housing during use
Complete with 9V battery, replacement pins, protective cap, and pouch case
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Description
Meter Description
1. Electrode pins protective cap
2. LCD display
3. Tri-color Bargraph
4. HOLD / POWER key
5. Protective cap attachment
6. Protective cap holders
7. MODE button
Notes:
Battery/Spare Pin compartment located on the rear of the
instrument
Electrode pins located beneath the protective cap
Calibration points located at the top of protective cap
LCD Display Description
1. Measurement reading
2. Battery status
3. Audible alert icon
4. Measurement mode
5. Display HOLD icon
Bargraph Display Description
The bargraph indicates WET / DRY measurements using three LED colors: Green (for dry),
Amber (for moderate moisture), and Red (for very moist). As the reading moves up the
bargraph scale from the DRY indicator to the WET indicator, the LED color changes from
green, to amber, and then to red.
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Operation
Electrode Pins
CAUTION: The electrode measurement pins are extremely sharp. Use care when
handling this instrument. Cover the pins with the protective cap when the
instrument is not in use.
The electrode pins are replaceable / removeable and must be inserted before the meter can be
used. To insert or replace the pins refer to the illustration and instructions below. Replacement
pins are stored in the battery compartment at the rear of the meter.
a) Remove the protective cap at the top of the meter by pushing it toward the back of the
meter.
b) To remove the pins, loosen the locknut at the base of the electrode pins
c) Install the new pins and tighten the locknuts
d) Replace the protective cap
1. Electrode pins
2. Locking nuts
3. Threaded posts
4. Electrode jacks at top of meter
Basic Operation for Pin Measurments
1
2
3
4
1. Remove the protective cap to expose the electrode pins. The cap snaps off easily if it is
pushed towards the rear of the meter
. The cap can be affixed to the side of the meter using
the protective cap holders (6).
2. Press the
key to turn the meter ON / OFF.
3. Press the MODE key to select the Wood Moisture Equivalent (%WME) mode of operation.
4. Carefully push the electrode pins a minimum of 0.07” (2mm) into the material under test.
Note that the pins should be inserted into wood perpendicular to the wood’s fiber structure.
For high moisture readings, it may take several minutes for the meter reading to stabilize.
5. Take several readings in several locations on the material for the best representation of the
amount of moisture present.
6. Read the measurement values on the LCD digital display and the LED bar graph
7. Replace the protective cap when finished.
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Basic Operation for Pinless Measurments
1. Ensure that the protective cap is attached to the meter covering the pins.
2. Press the
key to turn the meter ON.
3. Press the MODE key to select the Relative (REL) mode of operation.
4. The pinless moisture detector is located at the rear of the instrument, just behind the display.
Place the meter so that the sensor is touching the surface of the material under test.
5. Take several readings in several locations on the material for the best representation of the
amount of moisture present.
6. Read the measurement values on the LCD digital display and the LED bar graph.
Calibration Zero for Pinless Mode
1. Switch the meter to the Pinless mode of operation (REL mode).
2. Ensure that the meter is not near any objects or surfaces. Hold the meter near the bottom to
avoid contact with the pinless sensor.
3. Press and Hold the MODE button for 3 seconds until rEL appears in the display. Release
the MODE button and the display will blink for several seconds and then switch back to the
normal display mode.
4. The display should now read zero indicating that the calibration is complete.
5. If an E32 error is displayed, try the zero calibration again with the pins further away from any
objects or surfaces.
Calibration Check for Pin Mode
1. Switch the meter to the Pin mode (%WME).
2. The two calibration check points are located in the holes at the top of the protective cap.
3. Insert the electrode pins into the two holes at the top of the protective cap to make contact
with the test circuit.
4. The display should now read from 18.0 to 18.6, indicating that the calibration is verified. If
the reading is not correct, return the meter for service.
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LCD Backlight ON/OFF
With the meter switched ON
switches the LCD backlight ON and OFF.
Data Hold feature
The Data Hold function freezes the reading in the display. Press the HOLD key momentarily to
activate the Data Hold function. The reading will freeze and the ‘key’ display icon will appear. Press
the HOLD key again to exit the Data Hold function (the ‘key’ display icon will switch off).
, pressing and holding both front panel buttons (MODE and HOLD)
Meter Setup
To enter the setup mode:
With the meter switched OFF
buttons) simultaneously for two seconds. The display should now read ‘0 = x’ where ‘0’ is the
OPTION and ‘x’ is the SETTING.
Use the MODE (right arrow) button to change the SETTING.
Use the HOLD button to scroll through the OPTIONS.
The available OPTIONS and SETTINGS:
OPTIONS SETTINGS SET-UP INFORMATION
0 Switches all settings to ‘0’ (Factory Default*) 0
1 Others settings can now be changed. In addition, Backlight
1
2
*FACTORY DEFAULT SETTINGS: 0=0, 1=0, 2=0, 3=0
0 Audible alert beeps with increasing frequency from a nominal
1 Audible alert divided into 3 frequency levels
2 Audible alert beeps when user switches from one mode to
3 Beeper OFF. Audio alert display symbol switches OFF
0 Auto Switch OFF is not active. User must manually switch the
1 Auto Switch OFF active. Switches OFF after 3 minutes
2 Auto Switch OFF active. Switches OFF after 5 minutes
3 Auto Switch OFF active. Switches OFF after 10 minutes
0 Backlight OFF 3
1 Backlight ON
, press and hold both front panel buttons (MODE and HOLD
switches ON for 30 seconds and then automatically switches
OFF.
17.0 (REL) or 17% (WME) measurement value upwards
another
unit OFF
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Battery Replacement
If the instrument does not switch ON or displays the low battery symbol, replace the battery as
follows:
1. Slide off the rear battery compartment cover
2. Replace the 9V battery
3. Secure the battery compartment
4.
You, as the end user, are legally bound (EU Battery ordinance) to return all used
batteries, disposal in the household garbage is prohibited! You can hand over your
used batteries / accumulators at collection points in your community or wherever batteries /
accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Maintenance
Always keep the instrument dry
To clean, wipe the meter with a damp cloth. Use a mild detergent if necessary but never use
abrasives or solvents.
Prevent dirt from accumulating at the electrode pins
Specifications
Display Backlit LCD digital display and tri-color LED bargraph scale
Resolution 0.1%
Accuracy Pin mode: ± (5% rdg + 5 digits)
Pinless mode is a relative reading only
Measurement principle Electrical resistance (pins)
Electromagnetic sensor (pinless)
Range 0.0 to 99.9 %Relative (pinless)
6.0 to 94.8 %WME (pins)
Electrode pin length 11mm (0.44”)
Electrode pin type Integrated, replaceable
Power supply 9V alkaline battery
Low Battery Indication Battery symbol displayed on LCD
Meter housing Impact-proof plastic
Operating Temperature 32 to 122
Operating Humidity 80% Relative Humidity maximum
Dimensions 8 x 2.3 x 1.7” (203 x 58 x 43mm)
Weight 7.2 oz (204g)
Product specifications subject to change without notice
o
F (0 to 50oC)
www.extech.com
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