... for AC single phase active energy measuring. Wall-mounted installation type, smart designDisplay type: mechanical counter, unit is kwh, record accumulated ... total active energy.Display range: 5+1 ,6+1 ... single phase two wires,L, L, N, N,L,N,N,LImpulse constant:1600imp/kWhStandard level:1.0class,2.0classPower consumption of meter ...