Southwire® AC Clamp Meter, 400 A, 600 VAC/VDC Electrical Rating, 40 mOhm Resistance, 10 MHz Frequency, 1.2 in Jaw, 4000 Count, Backlit LCD Display, True RMS AC Response, +/-2.8 % AC Current Accuracy, +/-1.8% VAC, +/-0.8% VDC Voltage Accuracy, Safety Rating: CAT III 600 V, (2) AAA Battery Power Source, 41 to 104 deg F Operating, 7.9 x 2.6 x 1.5 in Dimensions