General Tools & Instruments MMD5NP Pinless LCD Moisture Meter
The wide range MMD5NP enables moisture measurement of a variety of materials without having to pierce the material's surface.  The unit has a range of 0.0 to 99.9-percent WME for wood, and 0.0 to 56.5-percent WME for building materials, and measures up to a depth of 3/4-inch.  It features a jumbo LCD display with intuitive on-screen icons for low and medium and high moisture content as well as a wood and concrete mode.