Sonin 50210 14% to 20% Pin LED Wood, Concrete, Plaster, Carpet and More Moisture Meter
Simple 4-light moisture meter system helps alert users to possible moisture problems. Use to check surfaces before painting, wallpapering, laying floors, staining decks and to detect roof leaks. Detects 14-20% moisture levels in wood, sheetrock, plaster, concrete, carpets and more. Operates on 9V battery (not included)..