SF-80 Frequency Meter Accuracy:Class 0.5 or class 1.0 Voltage:110V,220V,380V,415V,440V Frequency:45-55Hz,45-65Hz... ... 550-650Hz SF-80 Frequency Meter1. Accuracy: class 0.5 ... class 1.02. Voltage: 110V,220V,380V,415V,440V3. Frequency: 45-55Hz,45-65Hz,55-65Hz,47-53Hz,57-63Hz ... or have further enquiry, welcome to contact us. 80 Frequency Meter