Product Introduction 3-phase energy meter calibrator introduction: HZ-3521 handheld meter field calibrator is a measurement of electrical parameters power meter calibration wiring judged as one of the high-precision test instrument. Product Characteristics 3-phase energy meter calibrator introduction: TKSX-3 handheld meter field calibrator is a measurement of electrical parameters power meter calibration wiring judged as one of the high-precision test instrument. 3-phase energy meter calibrator technical parameters: Input feature Voltage measuring range: 0 ~ 400V 57.7V 100V 220V 400V fourth gear automatic switching range. Current measuring range: 0 ~ 5A built-in transformer into 5A (CT) files. Clamp transformer for the 5A (small pliers) 25A (small pliers) 100A (the clamp) 500A (the clamp) 400A (tongs) 2000A (tongs) six stalls. (Including medium and large Clamp Meter is optional) Phase angle measuring range: 0 ~ 359.999 Frequency Measurement Range: 45 ~ 55Hz.