SPECIFICATION:Used for AC single phase active energy measuring. Wall-mounted installation type, smart designDisplay type: ... to IEC62053-11 standardAccording to IEC62053-21 standardFUNCTIONS:Total energy= positive active+negative active Indicate of reverse measuringDisplay data ... frequency:50Hz, 60HzStarting current: 0.004IbConnection type choice: single phase two wires, L, L, N, NL,N,N,LImpulse ...