Product DescriptionThe General Tools MMH800 4-in-1 Pin/Pad RH Moisture Meter is ideal for locating water leaks and measuring moisture content of wood, drywall, plaster walls, carpeting, flooring, brick, grout, soil, paper or powders. High levels of moisture that go untreated are the main cause for harmful mold growth in the home. This tool features both pin-type and pinless (flat pad) surface sensors. With the MMH800 combo moisture meter, scanning large areas of drywall and wood is easy with the pinless pad sensor. Once moisture patches are detected, flip open the cap to expose the pin sensors for more exact moisture content readings. It features two displays; one for moisture content and one for ambient temperature and humidity. The unit provides a moisture level range of 5-percent to 50-percent in wood and 1.5-percent to 33-percent in building materials, and offers an audible indication of moisture level and storage of moisture level readings. It holds moisture level readings for convenient viewing later. The tool also has an auto diagnostic check and auto power off. Powered by a 9 volt battery (included). The unit also comes with a lanyard, 2 sets of spare pins and a user?s manual.Moisture Measurement Ranges:5 to 50% moisture (wood);1.5 to 33% moisture (building materials)Moisture Measurement Accuracy: ±3%Moisture Measurement Resolution: 0.1%Humidity Measurement Range: 25 to 95%Humidity Measurement Accuracy: ±5% from 0° to 40°CTemperature Measurement Range: 32° to 140°F (0° to 60°C)Temperature Measurement Accuracy: ±2°F (±2°C)Operating Temperature: 25° to 45°F (-4° to 7.2°C)Operating Humidity: 95% maxStorage Temperature: 23° to 140°F (-5° to 60°C)Storage Humidity: 95% maxAuto Power Off: After 3 minutes of inactivityDimensions: 7.13 x 2.17 x 1.57 in. (181 x 55 x 40mm)Weight: 4.06 oz. (115g)Power Source: 1 ?9V? battery (included)From the ManufacturerIdeal for locating water leaks and measuring moisture content of wood, drywall, plaster walls, carpeting, flooring, brick, grout, soil, paper, or powers, this unit features both pin-type and flat surface sensors. It features tow displays; one for moisture content and one for ambient temperature and humidity. The MMD800 provides a moisture level range of 5-percent to 50-percent in wood and 1.5-percent to 33-percent in building materials, and offers an audible indication of moisture level and storage of moisture level readings.GENERAL TOOLS - THE PRECISE TOOL FOR DOING THE JOB EXACTLY RIGHT. Offering over 1,000 tools, we?re proud to provide tradesmen, craftsmen and DIYers around the world with a broad range of affordable, specific-purpose mechanical hand tools and precision measuring and inspection tools.For inquiries, please contact our Customer Service Department at 212-431-6100. We strive to provide our customers with 100% satisfaction.WORK SMARTER, MEASURE BETTER & BE MORE PRODUCTIVE WITH GENERAL TOOLS