Extech MO257 Operating Manual
User's Guide
Pinless Moisture Meter
Model MO257
Introduction
Congratulations on your purchase of the Extech MO257 Pinless Moisture Meter. The
pinless moisture sensor monitors the moisture in wood and other building materials without
causing surface damage. High frequency sensing technology allows the meter to take noninvasive moisture measurements. User programmable alarms alert the user if moisture
measurements exceed alarm set-points. This meter is shipped fully tested and calibrated
and, with proper use, will provide years of reliable service.
Meter Description
1. Measurement sensor
2. Power ON-OFF button
3. LCD display
4. Measure (MEAS) button
5. UP and BACKLIGHT button
6. SET button
7. DOWN button
Battery compartment located on rear of unit
LCD Display
1. Low Battery icon
2. Main LCD display
3. MAX reading
4. MIN reading
5. HOLD function
6. Measurement alert
7. MAX mode icon
8. MIN mode icon
Battery Replacement
1. Turn off the meter
2. Remove the Philips head screw located on the rear of the unit
3. Lift off the rear battery cover
4. Replace the three (3) ‘AAA’ 1.5V batteries
5. Secure the rear battery cover
2
MO257 V1.0 04/10
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