SFIM's SF, DND, SFC series meters and direct acting indicating analogue electrical measuring instruments. Model unit A, B, C, D, E, F, G SF-52: 58, 66 ... .5, 4.5, 26, 40.5, 52, 39mmApplicationsSFIM's SF, DND, SFC series meters ... current, voltage, frequency, power and reactive power, power factor,synchroscope, phase indicator and the other non-electric value. SF-45 Round ...