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MO257: Pinless Moisture Meter

Non-invasive moisture content measurements in wood/building materials

View Datasheet > MO257


Take pinless (non-invasive) Moisture measurements on wood and building materials without damaging the surface with the depth of approx <0.78″ (20mm) with Extech’s MO257 Moisture Meter. The ball moisture sensor provides smooth gliding on hard or delicate surfaces. Easy-to-operate with automatic calibration of the meter when powered on. Large backlit triple LCD displays moisture reading and Max and Min readings. User can adjust two alarm levels where it will show visual alert with flashing “RISK” or “WET” indicators with beeper alert. Ideal for building restoration projects and applications where moisture detection on floors, tiles and under carpets is critical. A must have tool for analyzing the after-effects of water leakage behind walls and in ceilings and also measuring moisture content on a non-flat surface.

Additional information

Moisture Range

0.0 to 100.0

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 100.0

Display icons

HOLD, DRY, RISK, WET, MIN, MAX and low battery icon

Operating Humidity

90%, 0-30°C (32-86°F), 75%, 30-40°C (86-104°F), 45%, 40-50°C (104-122°F)

Power Supply

Three (3) 1.5V 'AAA' batteries

Auto Power Off (APO)

After 30 minutes of inactivity


235 x 63 x 28mm (9.2 x 2.5 x 1.1")


218g (7.7oz)

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