What is a tachometer used for?

A tachometer is a device used to measure the rotation speed of an object, typically a motor or engine. It can help monitor the performance of a machine by measuring the rate at which it is rotating. Tachometers can be digital or analog, and can display the rotational speed in revolutions per minute (RPM) or in another unit of measure.

Tachometers are commonly used in automotive applications to monitor the RPM of a vehicle's engine. They can also be found in industrial machinery, marine equipment, and aircraft. By measuring the RPM, tachometers can help ensure that a machine is operating at the desired speed, detect any abnormalities or malfunctions, and assist in troubleshooting and maintenance.

Some tachometers are handheld devices that can be temporarily attached to an object to take a reading, while others are permanently installed in a control panel or dashboard. They can be wired or wireless, and some modern tachometers can even connect to a computer or smartphone for data logging and analysis.