S200B Multi-phase Voltameter is a multi-functional instrument developed specifically for on-site measurement. It is precise, consistent, low power consumption, and easy to operate, it directly measures A.C. voltage and A.C. current without having to disconnect the circuit under measurement. Whether it be the phase between two voltages, between two currents, or between voltage and current, it can all be measured. In addition, the power factor and power of the circuit can be measured indirectly, which can distinguish three Phase sequences, transformer wiring group, inductive, capacitive circuit, test the secondary circuit and bus differential protection system, identify phase relationship between each group of differential protection CT, verify the wiring of the watt-hour meter. The instrument has a large backlight LCD, with character sizes up to 40mm, the display is clear and easy to read.