This moisture sensor helps to find and pinpoint any slow leaks inside walls, under floors and above ceilings that can lead to water damage, mold, and mildew. Use it on firewood to ensure what you are burning is dry and won& 39;t cause creosote build up in your chimney (Santa and your chimney sweep will appreciate your thoughtfulness. Features: - 100% Brand New Digital Wood Moisture Meter Handheld Humidity Detector Tester - Measure range : 0 - 99.9% - Resolution : 0.1% - Resolution and accuracy /-0.5% - Large LCD with data hold function to show measure results - Auto power off functions - Low battery icon - Press "POWER" button to close the device - Press "MODE" to select matching wood groups - 15min Auto power off function save your battery - 4 Modes