... -mounted installation type, smart designDisplay type: LCD, unit is kWh, record accumulated total active energy.Display range: 5+1, 6+1 Accuracy ... IEC62053-11 standardAccording to IEC62053-21 standardFUNCTIONS:Total energy= positive active+negative active Indicated of reverse mearsuringDisplay data after power off (option ... constant:1600imp/kWhStandard level:1.0class,2.0classPower consumption of meter: