Common panel meter Frequency meter

Frequency Meter Pointer Type Model:  HH-96  HH-72  HH-48Class:  1.5Volt:50V 100V 220V 380VFrequency:44-55Hz  45-66Hz  55-65Hz  47-53Hz  57-63Hz  44-56Hz  54-66Hz  450Hz-550Hz550-630Hz 

analog frequency panel meter