This unit determines the moisture content of wood or building materials, such as concrete, brick, screed, plasterboard, wallpaper, etc. The measurement range for wood is between 5 to 50% and 1.5 to 33% for building materials. It has a large easily read LCD display (in percent with a resolution 0.1 %) as well an audible signal (this can be deactivated). A practical hold function makes measurement possible at locations with difficult access. The sensitivity is automatically controlled for best performance. To save battery power the unit has an automatic switch-off function. Powered by a 9V battery (not supplied). All in all this is a robust, handy and excellent value detector.