DURFICST 3-inch Color HD Large Screen Moisture Meter with Cloth Bag, 20-40mm Depth Analysis, for All Building Materials, Wood, Wall, Plaster, Masonry100% Non destructive Measurement: No need to insert electrodes or probes into the material to be measured, the high frequency waves emitted by the sensor of DURFICST moisture meter can penetrate about 40 mm into masonry, and the humidity measurement will never damage the surface of the object. The ball probe allows users to easily measure in tight areas without leaving marks, and can easily measure the moisture content in corners, uneven surfaces and