A moisture meter tells the user how much water is in a material. It does this by measuring voltage and converting it to a number readout on the device's screen (in millivolts). This reading can be calibrated for different types of surface material and then used to identify areas with high humidity levels where mold growth might occur if left untreated or to find leaks from pipes under floors and walls due to hydrostatic pressure.

General Tools MMD7NP Moisture Meter is a non-invasive, non-marring tool that can be used to detect moisture under finished surfaces. It has separate settings for drywall, masonry, softwoods, and hardwoods. The woodworking tool is auto-calibrating and operates on a 9V battery. The 2-Inch diagonal backlit LCD screen and a 3 color LED bar graph are easy to read. It has a 3/4 inch maximum sensing depth and plus / minus 4 percent accuracy on wood. The moisture meter also features a HOLD button, auto power-off function, out-of-range alarm, and low battery indication.

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