Vintage JBT Model 31-FX-50 Frequency Meter (48-52 Hz)Vintage JBT Model 31 FX 50 Frequency Meter (48 52 Hz) This listing is for a genuine vintage JBT (J B T Instruments, Inc.) analog frequency meter. This gauge is a "vibrating reed" type, known for its extreme reliability in industrial settings. It is designed to measure alternating current (AC) frequency for systems operating nominally at 50 Hz, specifically within the range of 48 to 52 Hertz. It is an ideal component for monitoring legacy power
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Vintage JBT Model 31-FX-50 Frequency Meter (48-52 Hz)