MO25: Moisture Pen

  • Ideal for building restoration applications such as detecting water leakages inside walls ceilings and floors
  • Use on wall board sheet rock cardboard plaster concrete mortar paper fabric and more
  • Five dual color LEDs indicate 10 moisture levels:
    • Green LEDs 5% 7% 9% 11% 12%
    • Red LEDs 14% 16% 20% 30% 40%
  • Easy-to-use one button operation
  • Data Hold and Auto power off
  • Battery level check on power-up
  • Complete with protective cap, built-in pocket clip, and one AAA batter
  • English Datasheet
  • Multilingual User’s Manual (En/Es/De/Fr/It/Pt)
SKU: mo25-moisture-pen Categories: , Tags: ,


Compact moisture meter for wood and building materials

The Extech MO25 is a pen styled moisture meter that is light weight, compact and easy to use with field-replaceable pins. After selecting one of ten moisture levels the user is signaled via audible alert and LED indicator lights that the object being tested surpasses the given threshold. This moisture pen features a data hold function, battery level check and automatically powers off when not in use. Use on wall board, sheetrock, cardboard, plaster, concrete and mortar. Complete with two pins (installed), protective cap, built-in pocket clip, and one AAA battery.

Specifications Range
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