High reliability, small size, light weight, beautiful appearance Good anti-electromagnetic interference, low power consumption, high precision, high overload, high stability, anti-stealing, long life. May select function(display voltage, current, power, frequency, power factor) Ideal for dividing electrical equipment into several separate electrical installations, as well as medical consumption in each individual area. suitable for measuring single-phase AC active energy with rated frequency of 50Hz or 60Hz, for fixed installation indoors. It is suitable for ambient temperature not exceeding -25°C+55°C, relative humidity is not more than 95%., Manufacturer: FTVOGUE