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Tachometer
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A tachometer 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.
A tachometer that can indicate up to 7000 RPM (left)
A tachometer that can indicate up to 7000 RPM (left)
Cessna 172's G1000 tachometer (1,060 RPM) and engine hours (1736.7 hours)
Cessna 172's G1000 tachometer (1,060 RPM) and engine hours (1736.7 hours)
A tachometer on a tractor, reading up to 3000 RPM, with the hour meter below it showing 772.9 hours. The mark at 2500 RPM is the engine speed required
A tachometer on a tractor, reading up to 3000 RPM, with the hour meter below it showing 772.9 hours. The mark at 2500 RPM is the engine speed required to run the power take-off at 540 RPM.
Revolutions per minute
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Revolutions per minute is a unit of rotational speed for rotating machines. One revolution per minute is equivalent to 1/60 hertz.
A car's tachometer marked in multiples of a thousand rpm
A car's tachometer marked in multiples of a thousand rpm