... , 26, 40.5, 52, 39mm SF-65: 73.5, 83.5, 4.5, 3 SF-65 Round panel meterModel unit A, B ... of power plant and the different apparatus to measure the DC current,voltage AC current, voltage, frequency, power and reactive power ... ,synchroscope, phase indicator and the other non-electric value. SF-65 Round Panel Meter