FNIRSI WMT-10 Index Humidity Meter Hygrometer. The FNIRSI WMT-10 is a non invasive moisture meter designed for fast and accurate measurement of material humidity without damaging surfaces. It uses induction based sensing technology to measure moisture in wood, walls, floors and construction materials. The device offers four dedicated modes for softwood, hardwood, masonry and powder wall surfaces, covering a measurement range up to 75 percent with a resolution of 0.1 percent. A 2.4 inch TFT color display ensures clear readability, while a built in flashlight supports use in low light environments. The 1000 mAh rechargeable battery with USB C charging provides long operating time and convenience.