Fluke a clip-on current transformer. Measuring range selectable per software: 0.05 A to 5 A and 0.5 A to 50 A. Peak current for sinusoidal currents: 18 A and 180 A. Intrinsic error: 0.5 percent. Frequency range: 40 Hz to 10 kHz. Operating voltage: 300 V CAT IV. Phase error: 0.5 degree. Jaw opening: less-than 15-millimeters diameter or 15-millimeters by 17-millimeters bus bars.