The Extech PRC20 Handheld Thermocouple Calibrator is pocket friendly with double molded casing and an ample dot matrix illuminated blue LCD. Provides high accuracy calibration function to imitate precision thermocouple outputs for use in calibrating transmitters, thermometers, recorders, or controllers. Displays output in temperature or millivolts. Allows up to five users to program their own calibration presets.