Big Horn 19921 Timber Check Moisture Meter allows you to take moisture readings in any species of wood with a moisture content of 6 to 25 percent. Durable fixed component circuitry virtually eliminates the possibility of false readings and never needs to be re-calibrated. All components, including probing pins, are securely held in place with screws and are non corrosive. Measures 6 3/4" long and comes complete with an extra set of probing pins, one 9 volt battery, a wood species moisture chart and instructions.