tachometer
Sign in to savethumb|300px|A tachometer that can indicate up to 7000 revolutions per minute|RPM (left)
Article
7 sectionsContents
- History
- In automobiles, trucks, tractors and aircraft
- Traffic engineering
- In trains and light rail vehicles
- In analogue audio recording
- See also
- References
thumb|300px|A tachometer that can indicate up to 7000 revolutions per minute|RPM (left)
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.