RioRand ACM03 Auto Range Digital Clamp Meter 400 AC DC Current Hz Tester Powered by RioRand Advanced Technology Maximum voltage between terminals and earth ground: DC 1000V or AC 750V. Perform measurements of AC/DC voltage and current, resistance, frequency, duty, capacitance, as well as continuity and diode test; Reading hold function. Over range protection for all ranges. Display: 4000 counts with analog bar LCD display.