1) DDS881electric energy meter 2)High reliability 3)CE,CB,ISO9001,14001, ... reliable stepping motors etc. Type DDS881 single phase electronic energy meter is the newest power counting products in our country ... . In order to monitor and control active energy easily, it adopts testing signals with light-coupled output and light diodes ... 60),20(80),30(100)Dimension: DDS881 electronic energy meter(KWH Meter)