Passive Probes. Bandwidth: 100KHz; Maximum continuous current 20Arms; Peak current 60A; Switching ratio: 50mV/A; 5mV/A; DC measurement accuracy: 50mV/A (0.4A-10ApK) ± 2%; 5mV/A (1A-60ApK)±2%; 9V battery-powered. CP4000 Series probes adopt electromagnetic induction technology, to measure AC / DC current . They can measure from dozens of mA apeak to 200A, with the advantages of low phase . Besides, they can guarantee the accurate measurement of power voltage output (mV) effectively, Furthermore, they can measure cables, and be used in narrow spaces, because of the a narrow clamp design.