What Does a Tachometer Measure?


Quick Answer

Tachometers are instruments that measure speed, or the rate of revolutions of a shaft. Tachometers are attached to automobiles to determine the revolutions per minute on the engine's crankshaft.

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Full Answer

Tachometers have markings on their gauges to indicate safe operating speeds. This information can assist the operator in choosing the right settings for the driving conditions. Long-term abuse of a crankshaft may cause poor lubrication, overheating, excessive speed, excessive wear or permanent damage to the engine.

Tachometers are also used to measure automobile traffic speed and flow. A test vehicle armed with a sensor goes on a run around a designated area. Data is collected and analyzed to evaluate traffic design and other forms of traffic engineering.

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