The Extech IR100 Mini IR Thermometer has a temperature range from -34 to 446ºF. Its fixed 0.95 emissivity covers 90 percent of all surface applications. Meter has an economical miniature sized design for better convenience. This thermometer features automatic data hold when the measure button is released and it has max/min hold and an auto power off function. Also, there is a lock feature for continuous scanning. The Extech IR100 Mini IR Thermometer comes complete with a CR 2032 3V battery.