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 non-invasive 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.
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.
Operation Pinless Moisture Measurements 1. Press the power 2. As described below, you must calibrate the meter before first use. button to turn the meter on. 3. To calibrate, press the MEAS button immediately after powering on the meter. The display will audibly beep and visually flash the CAL display icon. Keep the measurement sensor at least 3 to 4” (8 to 10 cm) from any object during calibration. 4. When the calibration is complete the beeping and flashing stop.
Auto Power Off To conserve battery energy, the meter will enter a sleep mode after approx. 30 minutes of inactivity. Press the power button to wake the meter. Backlit LCD Press the up/backlight button to switch the backlighting ON or OFF. Specifications Function Range Accuracy Moisture Range 0.0 to 100.0 Relative only Measurement Depth 20 to 40mm (0.79 to 1.57”) Display type Backlit LCD Display digits Three (3) numeric displays; each displaying from 0.0 to 100.
