Question

Name the device used for measuring speed of rotation?​

Answer 1

Answer:

A tachometer. It is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine.

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Answer 2

Explanation:

A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common.

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