... (W)x90(D)mm Digital Sigle-phase Current Voltage Meter Performance feature High-precision measurement of Single -phase grid active power, reactive power, ... Relative humidityElevation0.5 Class0.5 Class0.5 ClassSingle-phase,Three-phase four-wire, three-phase three-wireAC57.7V,AC100V,AC220V,AC380VAC1A,AC 5AVoltager ... 70°C≤93%,Place without corrosive gas≤2500m Digital Sigle-phase Current Voltage Meter