... , D, E, F, G SF-52: 58, 66.5, 4.5, 26, 40.5, 52, 39mm SF-65: 73.5, 83.5, 4.5 Model unit A, B ... , C, D, E, F, G SF-52 ... and the different apparatus to measure the DC current,voltage AC current, voltage, frequency, power and reactive power, power factor,synchroscope ...