mach meter ( synonym found)

Definition of mach meter:

°A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
°A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc..

Definition of mach meter:

°A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.
°A device for measuring or indicating velocity or speed, as of blood, a river, a machine, etc..

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