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 Indicated of reverse mearsuringDisplay ... single phase two wires,L, L, N, N,L,N,N,LImpulse constant:1600imp/kWhStandard level:1.0class,2.0classPower consumption of meter ...