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 ... single phase two wires, L, L, N, NL,N,N,LImpulse constant:1000imp/kWhStandard level:1.0class,2.0classPower consumption of meter ...