Detailed Product Description Name: Frequency Meter 240°Type: SD-96, SD-72, SD-48, SD-80Size(mm): 96X96, 72X72, 48X48, 80X80Voltage: 50V 100V 220V 380V 440V Frequency: 45~55Hz, 45~65Hz, 55~65Hz, 47~53Hz, 57~63Hz, 44~56Hz, 54~66Hz, 450~550Hz, 450~650Hz, 550~650HzMounting: SF series is flush mounting with bracket.