B&K Precision 369B AC/DC Multifunction True RMS Current Clamp Meter, 400/1000 A AC/DC Current Range Digital clamp meter measures AC and DC current to 1,000 amp, AC voltage to 750V, DC voltage to 1,000V, frequency to 400kHz, resistance to 40 megohms, and capacitance to 40 microfarads True RMS sensing meter provides accurate readings when measuring linear or non-linear loads, regardless of waveform Clamp with 57mm (2.24") jaw opening measures current without touching or interrupting the circuit Relative function allows a measurement to be set as a reference value and displays subsequent measurements as positive or negative deviations from that value Meets EN safety standard 61010, and is rated for CAT III installations to 600V