... single-phase electric energy meter is used to measure the single-phase AC active power at 50Hz or 60Hz.CertificatesDDS686, Single phase energy meter, class 1, 220V, 10(60)A, 50HzThe energy meter ... of the type test are mentioned in KEMA report with reference number 2018548-QUA/CAL 02-1688. This meter conforms to GB ...