Detailed Product Description DD862 single phase watt-hour meter is an induction meter which is applicable to measure the rated frequency of 50Hz, and power loss of single-phase intercourse grid. The meter has the features of original design, justified structure, high overload, low power loss and long service time, etc. The meter has black plastic cover, transparent plastic cover, metal cover and glass cover. The current is 5(20)A, 10(40)A, 20(80)A, 30(100)A.