HQRP JT-4G Wood / Firewood Moisture Meter - Wood, Firewood, Wall Damp Meter 4-Pins and Home Inspection Tool HQRP Wood Meter plus HQRP Coaster; Measuring Range: 5% - 40%; Resolution: 1%; Accuracy: 1%; Measures the containing water of wood, bamboo, cotton, tobacco, paper, foodstuff etc.; High resolution and quick response; Power: one 9V battery INCLUDED.