The Extech EX470-NIST-L True RMS Multimeter and Infrared Thermometer with Capacitance, Frequency, and Duty Cycle Measurements and 2 K-Type Remote Probes is the perfect meter for HVAC or plant maintenance. The IR thermometer measures the surface temperature from -4 to 518 degrees Fahrenheit (-20 to 270 degrees Celsius) without contact. The built-in laser pointer centers the measuring area. Multimeter functions include AC and DC Voltage to 600 Volt, AC and DC current to 20 Amp, resistance to 40M, continuity and diode test. Also includes Type K thermometer for contact or air temperature measurements from -4 to 1832 degrees Fahrenheit (-20 to 750 degrees Celsius). Advanced functions include Capacitance, Frequency and Duty Cycle. With limited NIST Calibration.