Double Clamp Digital Phase Voltammeter, direct measurement of AC voltage and AC current in the measured circuit which not open-loop, measure the phase between two voltages, two current and voltage current, and indirectly measure the power factor and power of the circuit. 1. Model No.: ETCR4000 2. Voltage Range:0~500V; 3. Current Range :0~20A; 4. Phase Range :0~360°; 5. CT Size:Φ8mm; 6. Power Supply : DC9V LR61.5V AAX6PCS