Features: Celsius/Fahrenheit selection Data hold function Laser target pointer selection Backlight display selection Auto power off Low battery indication Non-contact and reliable laser pointer sighting for accurate measurement Accessory: 9V battery, manual Application: factory test, field work Function: SNT550 Measuring range: -50 to 500 Celsius degree Accuracy: +/-2% / +/-2Celsius D:S ratio: 12:1 Emissivity: 0.1-1.0 adjustable Resolution: 0.1 Celsius or 0.1F Response time: 500ms Max/min: yes Backlight: yes Auto power off: yes