... Analog frequency meter 2)Panel size 80x80mm 3)Voltage: 220V 4)Measure 45-65Hz, Class 1.5 5)High quality material Square Type Frequency MeterPointer frequency ... 1.0 Voltage: 110V,220V,380V,415V,440V available Frequency: 45-55Hz,45-65Hz,55-65Hz,47-53Hz,57 ... digital panel meters. Different panel sizes(e.g 96,72,48) and measuring range can be customized. Square shape moving coil type Panel Frequency Meter ...