... electronic single-phase multi-tariff watt-hour meter is used to measure AC50Hz active energy, with features of long life, ... can ensure the data been memorizedautomatically scroll the accumulative energy, accumulative energy of each tariff,present date and time, and signal ... with the relative technical requirements for class 1 single-phasewatt-hour meter in GB/T17215-2002 (IEC61036-2000), and its ...