Proster Damp Meter Digital Wood Moisture Meter Handheld Moisture Tester with LCD for Wood Walls Firewood Logs Lime Wall Plaster Cardboard Paper Brick Wall Proster Digital LCD Damp Meter Wood Moisture Tester: for Wood, Firewood, Wall, Paper, Cardboard Humidity Measuring Wide range & High accuracy Moisture test range: 0~99.9%; Accuracy: 0.5%; Resolution up to 0.1%. Electrode length: 10mm (0.4") Suitable for a lot of wood Memory Contains 4 Wood Groups with Calibrations for Approximately 50 Species of Wood Multi-function Data Hold Function, convenient to read data in the lagre LCD display. Auto power off function, Conserves the Battery Energy wiht Low Battery Display Measurement principle Electrical resistance 2x 10mm (0.4") Integrated electrode pins; Operating Temperature: 0~40 (32F~104F); Operating Humidity: 85% Relative Humidity Maximum