Detailed Product Description SF-80 Frequency Meter 1. Accuracy: class 0.5 or class 1.02. Voltage: 110V,220V,380V,415V,440V3. Frequency: 45-55Hz,45-65Hz,55-65Hz,47-53Hz,57-63Hz,450-550Hz,450-650Hz,550-650Hz.......More detailed products information or have further enquiry, welcome to contact us.