USM-16 is 3-phase 4-wire direct connected FM16S ANSI meter, comply with ANSI standards (ANSI C12.1, A...

USM-12 is 2-phase 3-wire direct connected FM12S ANSI meter, comply with ANSI standards (ANSI C12.1, A...

USM-9 is 3-phase 4-wire CT connected FM9S ANSI meter, comply with ANSI standards (ANSI C12.1, ANSI C1...

USM-2 is 1-phase 3-wire direct connected FM2S ANSI meter, comply with ANSI standards (ANSI C12.1, ANS...