Qué (quién) es rev counter - definición
MEASURING DEVICE USED TO MEASURE ROTATIONAL SPEED
Tachometry; Tach; Hourmeter; Hour meter; Hours meter; Revolution counter; Rev counter; Revolution counters; Revolution-counter; Revolution-counters; Revolutioncounter; Revolutioncounters; Tachometers; Tach generator; Shaft tachometer
![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.](https://commons.wikimedia.org/wiki/Special:FilePath/Tractor hour meter and tachometer.jpg?width=200 "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.")
rev counter
¦ noun an instrument that measures the rate of revolutions of an engine.
rev counter
A rev counter is an instrument in a car or an aeroplane which shows the speed of the engine. (BRIT)
= tachometer
N-SING
Tachometry
·add. ·noun Measurement by a tachometer; the science or use of tachometers.
Wikipedia
Tachometer
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.
The word comes from Greek τάχος (táchos "speed") and μέτρον (métron "measure"). Essentially the words tachometer and speedometer have identical meaning: a device that measures speed. It is by arbitrary convention that in the automotive world one is used for engine revolutions and the other for vehicle speed. In formal engineering nomenclature, more precise terms are used to distinguish the two.
