Square Type Hz Meter 1, 20 years production experience. 2. Strong technical support, 3. Good quality guranteed. Square Type Hz MeterModel:90°RB -96-6, RB-72-6, RB-48-6The frequency meter is intended for measuring of frequencies ranging from 45~65Hz and 350~650Hz.Accuracy: Class 1.0 or class 0.5Specification:Voltage:50V 100V 220V 380V 440V Frequency: 45~55Hz, 45~65Hz, 55~65Hz, 47~53Hz, 57~63Hz, 44 ...