Detector This humidity sensor helps detect and pinpoint any slow leaks in walls, under floors and ceilings that can cause water damage, mildew and mildew. Use it on firewood to make sure what you're burning is dry and doesn't cause creosote to build up in your chimney (Santa and your chimney sweep will appreciate your thoughtfulness. Functions: -100% New Digital Wood Moisture Meter Handheld Moisture Detector -Measuring Range:0-99.9%-Resolution:0.1%-Resolution and Accuracy/-0.5%- Large LCD with data hold function to display measurement results- Auto Power Off Function - Low battery icon - Press "Power" button to turn off the device - Press "Mode" to select the matching wood group - 15 minutes auto power off function saves your battery - 4 modes and about 50 kinds of wood