... Measuring of frequencies ranging from 45~65Hz and 350~650Hz. 50V,100V,220V,380V,440V. Square Type Moving Coil Frequency Meter1 ... . Model:90°SF-144-3, SF-96-3, SF-72-3, SF-48-3.Pointer frequency meters are intended for measuring ... /SFT-F48 isClass 1.0, other is class 0.5.3. Voltage: 50V, 100V, 220V, 380V, 440V. 4. Frequency: 45~55Hz, 45 ...