... design DSR01 and DSR02 and DD1356 types single-phase watt-hour meters are of inductive types, used for measuring the active ... dust, salt fog or condensation. The technical indexes of watt-hour meter are in accordance with GB/T15283-1994, IEC521-1998 ... runs flexibly, with low frictional moment and stable running; Shell: glass shell with super-high transparency. Technical parameters