you need a tachometer
Revolutions per minute, aka rpm.
portable tachometer is used to measure the RPM of rotating devices such as fans and gears. It can also be used to measure the linear surface speed of moving devices such as conveyors and treadmills.
on the tachometer
Revolutions per minute, aka rpm.
The tachometer is an electrical device that senses the ignition system. It indicates engine RPM (revolutions per minute). Engine rpm and crankshaft rpm are two ways of expressing the same thing. True, the crankshaft does rotate twice for each complete set of cylinder firings but the tachometer counts each rotation.
exact RPM
Laser tachometer are instruments used to measure the rotation speed of a shaft or disk, as in motor or other machine. They usually display the revolutions per minute (RPM) on a calibrated analogue dial or digital display.
The speed of rotation of a shaft can be measured using a tachometer. A tachometer works by measuring the rotational speed of the shaft in revolutions per minute (RPM) or rotations per second. It provides a digital or analog display of the shaft's speed.
A tachometer is a device used to measure the speed of rotation of an object. It typically works by counting the number of rotations per minute (RPM) of the object being measured, providing a numerical output that indicates its speed of rotation.
The inventor is unknown for a tachometer. However, the first documented use of a tachometer device was by the German engineer Dietrich Uhlhorn in 1817. He is credited with its first use, but not necessary as being its inventor.
On your tachometer RPM stands for Revolutions Per Minute ( it indicates how fast the engine is turning )