Max/Min Record/EMS AdjustmentSwitch mode to Max or Min status,then long prss trigger to find the Max/Min value during the continuous measurement ; Emissivity 0.95 preset and 0.8 optional. Self calibration between -5.0 and +5.0(-41 to 41)The non contact infrared thermometer are packed well together with blister package and batteries,you will be impressed by the self calibration function,if the temperature is 26.3 and the temperature value measured is 25,then and 1.3 should be increased as a calibration value,customer can calibrate the infrared laser thermometer between -5.0 and +5.0(-41 to 41). Distance spot ratio: 12:1 C/F switchableThe 12:1 ratio means at 12 the laser temperature meter is accurate for a one inch spot. So the farther you get away from the spot being measured, the less accurate it will be. think of the non-contact infrared thermometer like a cone. Application, not for peopleThis optical thermometer is used for measuring the temperature of the objects surface, which is applicable for various hot, hazardous or hard to reach objects without contact safely and quickly ( NOTE: The measured temperature for humans or animals will not be correct.).