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Pinless Moisture Meter

Extech MO257

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Take non-invasive, pinless moisture measurements on wood and building materials with Extech's MO257 Moisture Meter. Easy-to-operate with automatic calibration, this meter has a ball moisture sensor that provides smooth gliding on hard or delicate surfaces. A large backlit triple LCD displays moisture reading and Max and Min readings; user can also adjust two alarm levels to display a visual alert (flashing “RISK” or “WET” indicators) plus a beeper alert. The MO257 is 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.

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  • Moisture detection without the risk of surface damage

    Relative pinless moisture reading for non-invasive measurement from 0.0–100.0 (0.1 resolution), with sensitivity from 20–40 mm (0.78–1.6 in) below the surface

  • Pro-level features for fast, accurate measurement

    Two adjustable alarm levels with visible and audible indicators, as well as automatic calibration (in dry air) when meter is powered on

  • The right tool for restoration and remediation

    Ideal for building restoration projects and applications where moisture detection on floors, tiles, and under carpets is critical

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General Specifications
Measurement Depth
0.79 to 1.57" (20 to 40mm)
Relative Moisture Content (Pinless)
0.0 to 100.0
Sensor Type
Pinless spherical
Additional Details
9.2 × 2.5 × 1.1" (235 × 63 × 28mm)
Backlit segment LCD
3 × AAA (1.5V) batteries
2 years
7.7oz (218g)
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Export Restrictions

Export Restrictions

The information contained in this page pertains to products that may be subject to the International Traffic in Arms Regulations (ITAR) (22 C.F.R. Sections 120-130) or the Export Administration Regulations (EAR) (15 C.F.R. Sections 730-774) depending upon specifications for the final product; jurisdiction and classification will be provided upon request.

Extech MO257