An RPM sensor measures rotation speed, usually of a crankshaft in a vehicle engine or on wheels in vehicles that move on a rail. They are more commonly called "tachometers."Continue Reading
Tachometers can be found in all types of vehicles, including aircraft. This information is usually conveyed to the operator through a gauge. In vehicles with manual shifting, a tachometer is necessary to know when to change gears.
Trains and other vehicles on rails use tachometers to measure wheel rotations. There are a number of applications for this such as automatically calibrating wheel diameter and tracking the total distance traveled.
Tachometers can also be found in audio tape recorders that use cassettes.Learn more about Technology