Descriptions:Measurement Range: 0~99.9%Accuracy up to 0.5%Resolution: 0.1% Electrode length: 10mm Operating Temperature: 0 to 40 Power Supply: 4 x AAA batteries (Not included)Specifications:Material: plastic Size: 145x 67x32mm Color: gray Display Readings in LCD Built-in Black Light Use on Wood, Paper, Cardboard, etc. Contain ABCD 4 wood groups for calibration selecting Auto Power Off in 15min Data Hold Function Low Battery Indication