USER MANUAL Dual Moisture Meter Pin and Pinless Moisture Measurements Model MO55
Introduction Thank you for selecting the Extech MO55 Pin and Pinless Dual Moisture Meter. The compact MO55 takes quick Moisture level reference measurements (in percent %) on wood and building materials. The MO55 can be used in pinless mode (rear sensor) or in pin mode. The MO55 is simple to operate and offers measurement digits, audible tones and ‘moisture drop’ icons to indicate moisture level content.
Description Meter Description 1. Protective cover and pin‐mode self‐test circuit 2. Measurement pins 3. LCD Display 4. Power button 5. Mode (M) Pin/Pinless and Material selection 6. Display Lock/Beeper button 7. Internal sensor (rear) 8. Battery compartment (rear) 1 2 3 5 6 4 7 8 Display Description 1. Moisture Drop icons (1 droplet for low moisture content, 2 for medium, and 3 for high) 2. Wood mode 3. Building Material mode 4. Beeper active icon 5.
Operation CAUTION: The electrode measurement pins are extremely sharp. Use care when handling this instrument. Cover the pins with the protective cap when not in use. Operating Steps 1. For pin mode, carefully remove the protective/test cap to expose the electrode pins. 2. Switch the meter ON by long press of the button. The meter emits audible tones and the display switches on when the meter powers up. If the meter does not switch on please check the battery in the rear compartment. 3.
Display Lock Press the Display Lock button to freeze the displayed reading. The icon is visible on the again to return to the normal operating mode. display when Display Lock is active. Press Beeper ON/OFF The beeper defaults to ON. To switch the beeper OFF, press and hold the Display Lock/Audible Beeper button until the icon disappears. When the beeper is active the audio display icon will be visible.
Specifications Display LCD with multi‐function indicators Measurement type Relative Moisture Content (%) Measurement principle Electrical resistance (pins) Electrical capacitance internal sensor (pinless) Measurement depth Pinless mode: < 25mm (1 in.) Auto Calibration Pinless mode in open air Measurement indication Digital, Moisture Droplet icons (1, 2, or 3 droplets) and audible tone with 8 levels of intensity indicating low to high moisture readings Measurement ranges PIN MODE: 5.0~50.
