1.Frequency Meter 2.Accuracy: class 0.5 or class 1.0 3.CE and ISO9001; 4.Voltage: 110V,220V,380V,415V,440V 96 Frequency Meter,Analog meter Accuracy: class 0.5 or class 1.0 Voltage: 110V,220V,380V,415V,440V Frequency: 45-55Hz,45-65Hz,55-65Hz,47-53Hz,57-63Hz, 450-550Hz,450-650Hz,550-650Hz Frequency meter size:96*96,96 Frequency Meter