The wood and plaster moisture meter functions using two measuring electrodes which are pushed into the material. The device measures the electrical resistance (and therefore the level of moisture) of the wood, wood-based material, plaster or mixed plaster. Made by Gann in Germany, the maximum measuring depth is 20-25 mm. Measuring range for wood moisture: 5-20 %, measuring range for plaster moisture: 0.3-3.5 %. Two settings for corrections due to wood type. Includes a standard 9 V PP3 battery and five pairs of replacement tips. Comes with German and English instructions.