Specification Display:1 3/4" LCD characters display Measurement principle:Electrical resistance Moisture Range:0~99.9% for Wood Resolution:0.1% Accuracy:0.5% Electrode length:10mm (0.4") Electrode pins:Integrated Auto Power OFF:After approx.10 minutes Power Supply:One 9V Battery(s) Meter housing:ABS plastics Operating Temperature:0 to 40 C (32 to 104F) Dimensions:145 X 67 X 32mm (5.7" x 2.6" x 1.3") Weight:200g (7.0 oz) Items Included One (1) Wood Moisture Meter One (1) 9V Battery(s) User Manual How to Use Take off the protection cap of the meter, and pre "POWER" button Pre "MODE" to select matching wood groups Pushed the pins into the wood, and it displays reading Until the reading stability, Pre "HOLD", and you can read the record Pre "POWER" button to close the device, or 15m Auto power off function save your Battery(s) Note:The batteries are not included in the package due to Aviation Security Check. Sorry for any inconvenience caused.