Moisture meter is very useful to measure moisture content in building material such as on concrete walls : floors: ceiling etc. It can be used in wide applicaions such as: For locating water leaks behind walls, above ceilings and below floors For Printing industries, check moisture content of paper before printing Operating Vlotage : 1 x 9v (6F22 / 6LR61 /1604) Operating Current <40mA max. Extreme low battery warning with a auto power off ( 20 secs.) when below 5.5v auto power off within 3 mins. in inactive mode hold switch button to freeze hold the LCD reading during moisture reading Operating Temperature 0 C - 50 C 30 F- 122 F Operating humidity 80% RH Max Moisture measuring range 6.0-99.9% Accuracy 3% Resolution 0.1%