Use the Extech MO53 Pinless Moisture Meter for non-invasive measurements on wood and other building materials with virtually no surface damage. The depth of measurement is approximately 20 mm (<0.75 in). This meter is easy-to-operate with display icons that indicate the levels of moisture content plus audible alert feature. A must-have tool for analyzing the after-effects of water leakage behind walls and in ceilings, the MO53 is ideal for building restoration projects and applications where moisture detection on floors, tiles and under carpets is critical.