It can detect CT/PT's volt ampere characteristics, transformation ratio, polarity, 5% and 10% error curves, angular difference ratio difference, CT primary current flow, CT demagnetization, and other items, easily realizing multiple uses of one machine. Adopt a single power input port; Only 8 test ports can complete all CT/PT testing projects. The wiring method is safe and simple, which is very suitable for on-site use, effectively reducing labor intensity and improving work efficiency;