general tools mmd4e digital moisture meter, water leak detector, moisture tester, pin type, backlit lcd display with audible and visual high-medium-low moisture content alerts, grays general tools whether you're a professional contractor or a conscientious home owner, general's ultra-sensitive moisture meters help you to easily detect hidden leaks in wood, concrete, plaster and carpet. available as both analog and digital models, the meters provide accurate moisture level readings and are great for new home inspections, locating roof leaks or even selecting dry lumber at the yard. 99.9 count lcd w/0.4 in. high digits. wood/building materials selection switch. low, medium and high moisture sounds and on-screen icons. high accuracy and resolution. data hold + auto power off + low battery indicator. replaceable stainless steel pins (#pind4e). powered by "9v" battery (included)., lot of 1