Metris Instruments TN400L Professional Infrared Laser Thermometer by Metris Instruments Infrared Temperature Range -58 degrees F to 750 degrees F. 9:1 Distance to spot size ratio. IR-SoC technology (Infrared System on Chip) and Batch Calibration technology. Infrared Accuracy +/- 2% of reading or +/- 2 degrees C. .1 degrees resolution for accurate readings. Selectable temperature units F/C. Emissivity preset to .95. Bright large amber back-lit LCD display. 2 AAA batteries (included) provide nominal 180 hours continuous operation.