This Pinless Moisture Meter is your first step in mold prevention. Water and moisture buildup in a home can lead to hazardous and unsafe living conditions. By checking suspicious water stains around the house, you can determine whether the area is wet (a perfect breeding ground for mold) or has long since dried. The MMD7NP non-invasive, non-marring moister tester detects potential moisture problems without making pinholes. Its pinless design is ideal for woodworking, flooring and other applications where it is important to not damage the wood or finished surface. This water leak detector also is helpful for water damage tracing, new home inspections and home restorations where large areas need to be scanned quickly and without harming the wall or floor surfaces. It also ensures the appropriate level of surface dryness before painting, sealing or treating wood or drywall. The sturdy, ergonomic shape and rubber side grips allow for comfort even when using for multiple measurements. Every moisture meter also features a hold function to freeze a reading to read later, auto power off and a low battery indicator. A “9V” battery is included in every package.