EXTECH MO25 Moisture Meter User Guide
- June 3, 2024
- EXTECH
Table of Contents
MO25 MOISTURE METER
USER GUIDE
Introduction
The MO25 measures moisture (%WME) in wood, brick, concrete, paper, & fabric and traces leakage inside walls, ceilings, and floors.
Description
- Contact pins (replaceable)
- Power/Hold button
- LED lamps
- Pocket clip
- Battery compartment
Operation
CAUTION: Electrode pins are extremely sharp, use care. Cover the pins with the protective cap when instrument is not in use.
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Press and hold POWER button for 3 seconds to switch ON or OFF. One LED lamp flashes when the meter is ON idling. The meter automatically switches OFF after 1 minute (if reading is <5%).
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Remove the protective cap to expose electrode pins.
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Carefully push the pins into the material under test. Insert the pins perpendicular to wood’s fiber structure.
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Take several readings in various locations for the best representation of the moisture present.
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Read the LED lamps as follows:
Green LED scale indicates wood moisture from 5.0 to 12.0%.
Red LED scale indicates wood moisture from 14.0 to 40.0%. -
Press POWER/HOLD button momentarily to freeze a measurement reading. Press again to disable the Hold function.
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Replace the protective cap when finished.
Battery Check and Replacement
When the unit powers up the status of the battery is indicated by the 5 LED lamps (5 lamps lit: full power; 1 lamp lit: minimum power). To replace the battery remove the Phillips head screw to access the battery compartment and then replace the 1 x 1.5VDC ‘AAA’ battery. Please secure the compartment before use.
Specifications
| Display | Dual scale red and green LED lamps |
|---|---|
| Measurement principle | Electrical resistance |
| Measurement Range | 5 to 40 %WME |
| Electrode pins | Integrated, replaceable |
| Auto Power OFF | After 1 minute (with reading <5%) |
| Power supply | 1×1.5VDC AAA battery |
| Battery status indicators | Lamps indicate status on power-up |
| Meter housing | Impact-proof plastic |
| Dimensions | 136 x 25 x 21mm (5.4 x 1.0 x 0.8”) |
| Weight | 33g. (1.2 oz.) without battery |
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