... Can test the three~phase AC voltage, current, phase between voltage, phase between current, phase between voltage¤t, frequency, phase, ... wiring correctly, check the circuit and equipment. This device applies to electric power, petrochemical corporation, metallurgy, railway ... amplitude when testing the phase frequency200mA±10mA2mA~20A/Voltage amplitude when testingthe phase frequency100V±20V10V~600V/ ...