A laser tachometer is a non-contact device that utilizes laser, which is pointed at the rotating object for the measurement of RPM. There are various detecting distances and they vary depending on the model, typically, it is within 78 inches (or 2 meters).

Laser tachometers feature a laser on the end of the device which can be pointed at a rotating object to measure RPM via a direct reading function. They are a type of non-contact tachometer and are ideal for use in difficult to access areas, such as tight spaces or working with industrial machinery.

A digital laser photo tachometer is a modern, electronic tool that measures the rotational speed of a motor or any other rotating equipment. It offers many advantages over traditional analog devices that use mechanical components to read RPMs.

Laser tachometers use a laser, or similar light source, to shoot light towards the object you want to measure. That light is aimed at a reflective mark that you make on the object you want to measure.

Laser tachometers work by shining a light source or a laser against something that is rotating or moving. The light source will be reflected by the reflective object on the rotating object. From there, what happens is that the optical sensor on the tachometer receives the signal and measures the speed from that signal.