A tachometer, or revolution counter, measures the rotation speed of an object within a machine. The value is typically displayed in revolutions per minute (RPM) via analogue dial or digital display. Tachometers are used to measure speed of rotation and some can measure linear speed and distance too. You can learn more in our guide to tachometers.

RS offers a wide range of tachometers from reputable brands such as Extech, Compact, and RS PRO, catering to various industrial and commercial needs. We also offer in-house calibration services for your tachometer if required.

Calibrated tachometers are essential for ensuring accurate RPM readings and maintaining the reliability of measurements. Calibration involves adjusting the tachometer to match a known standard, which helps in identifying optimal shift points, diagnosing engine problems, and ensuring efficient power delivery. Regular calibration is crucial for maintaining the accuracy and performance of tachometers, especially in critical applications

Types of Tachometer:

• Non-Contact Tachometer: Measures rotational speed without physical contact, often using infrared or laser technology to detect the speed of a rotating object.
• Laser Tachometer: Uses a laser beam to measure the rotational speed of an object by detecting the reflection from a reflective surface on the rotating part.
• Contact Tachometer: Requires physical contact with the rotating object, typically using a wheel or probe that touches the surface to measure its speed.
• Optical Tachometer: Utilizes a light source, such as an LED or laser, and a photodetector to measure the speed of a rotating object by detecting interruptions in the light beam caused by a reflective marker on the object.