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The Stanley Intelli Level Moisture Meter gives a % moisture reading based on electrical resistance across two pins. LCD screen with dual measurement bar graph. Measures moisture in wood: 6-44%, and other building materials: 0.2-2%. Power: 3 x Button Cell batteries (supplied).Additional Information:• Detection Range: Wood: 6-44%• Detection Range: Building Materials: 0.2-2%• Battery Type: 2 x AA (supplied)