The Extech EX430-NIST True RMS Autoranging Multimeter (with K Type, Capacitance, Frequency, and Duty Cycle) is a professional grade True RMS multimeter capable of performing a wide range of measurements. Functions include AC and DC voltage to 600V, AC and DC current to 20A, resistance to 40M, continuity and diode test. Also includes a Type K thermometer function for contact or air temperature measurements from -4 to 1832?F (-20 to 750?C). Advanced functions include Capacitance, Frequency and Duty Cycle. With limited NIST Calibration.