The Extech MO55 Combination Pin/Pinless Moisture Meter takes quick Moisture measurements on wood and building materials with choice of a pin or pinless (non-invasive) method. The MO55 features easy-to-operate display icons that indicate the levels of moisture content plus an audible alert feature. The pins are easy to install and replace. This product is 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.