The Ryobi RBPINMM1 Moisture Meter offers four modes to detect moisture content in softwood, hardwood, plaster and concrete aerated. With a measurement range from 0% to 99.9%, you can easily identify potential moisture damage at home, in caravans and on any potential wood working projects. The protective cap includes a self-test function, and the handy hold function allows for moisture percentage readings to be taken in hard-to-reach areas. Advanced electronics give a real time moisture percentage reading on screen and the intuitive LED’s light up according to the percentage moisture content levels in each material. The LED’s provide an easy-to-read visual guide; green for dry, yellow for mid-wet and red for wet. Supplied with 2 x AAA batteries.