Fluke 1630 Earth Ground Clamp Meter Digital clamp-meter measures ground leakage alternating current (AC) from to 0.2 to 30A and ground loop resistance to 1,500 ohms True RMS sensing meter provides accurate readings when measuring linear or non-linear loads, regardless of waveform Clamp with 33mm (1.3 inches) jaw opening measures current without touching or interrupting the circuit High/low alarm sounds when measurements fall outside settings programmed by the user Meets IEC safety standards 61010-1 and 61010-2-032 (pollution degree 2), and is rated for CAT III installations to 300V