... years 4.4+1digital regis DMM28 (DD28) single phase mechanical kilo watt-hour meter is applicable to measure 50 Hz or 60 Hz ... UV molded overall, or bakelite with glass window (optional); Meter base Aluminium, steel, bakelite etc; Meter terminal block is made of quality ... .5. The die-casing frame is alloy aluminium, molding with excellent mechanical strength, stable structure;6. Voltage components and ...