From the Manufacturer
This moisture meter has a large digital LCD readout 2-Inch by 1-1/8-Inch to display the moisture content in any wood. It is accurate to +/- 1 Percent and very easy to see. The range is from 0 to 40 Percent. This uses a standard 9 volt battery (included) and has an on/off button to retain battery life when not in use. A low battery symbol appears when the battery needs to be replaced. There is a protective cap to shield the two very sharp probe metering pins