Synchoroscope meter Voltage: Single Phases: 100V, 220V; Three Phases: 100V,220V,380V,440V High ... parameters.Phase synchronization measurement (frequency and phase equality) between two single phase or three-phase alternating current systems, or between system ... available on request. The nominal mark is S.Specification:Voltage:Single Phase 57V 100V 220V Three Phase 100V 220V 380V 440V ...