... series long-life single-phase watt-hour energy meter is used for measuring single-phase AC active ... reinforced fastening, to ensure the parts in the meter can't move.2.Strong magnetic property, magnetic ... 8.External structure and service life a.Metallic base and transparent plastic meter cover, whose service life can reach ... A, 2.5(10)A, 5(20)A, 10(40)A, 15(60)A, 20(80)A, 5(30)A and 10(60)A Energy Meter