A tachometer is any device that generates a signal proportional to the rotational speed of a joint. There are numerous types of tachometers some measure the frequency or time between pulses generated by the rotating shaft. This tachometer is a measuring device that measures an engine's operating speed in revolutions per minute. It refers to as a revolution counter. The device can measure the rotational speed of the shaft or disc while the machine is in motion. It is also used to describe the angular velocity of a rotating shaft. Key Features: It displays the rotational rate of the engine crankshaft and marking indicating the safe range of rotational speed Optical methods for measuring high-precision speed It can measure liquid flow using an attached wheel with an inclined angle. Use to calculate rotational speed. Show the engine crankshaft rotation rate For long-lasting use and high-quality materials Specifications: Brand: Faria SKU: F34617 Weight: 0.68 lbs