Extech MO257 Pinless Moisture Meter Non-invasive moisture content measurements in wood/building materials Relative pinless moisture reading for non-invasive measurement from 0.0 to 100.0 with 0.1 resolution Multifunction backlit triple LCD display Pinless measurement depth from 0.78-Inch (20mm) to 1.6-Inch (40mm) below the surface High frequency sensing technology