Usage and description:

Paste reflective sticker on the rotating thing, point laser measure towards reflective sticker.

Digital Laser RPM Tachometer Non Contact Measurement Tool
Readings are displayed on a large, easy-to-read LCD screen; stores last, minimum, and maximum reading;

features auto-zero adjustment
Includes 60cm of reflective tape for non-contact diagnostics and measurements. Capable of measuring at a distance from 5-50 distance.

Measures the RPM of any rotational part. Wide measuring range & high resolution.
Durable in using, large LCD displaying gives exact RPM data.
The last value / min value will be automatically stored in memory and can be displayed by turn anytime.

The housing has been carefully shaped to fit comfortably in either hand.
It is a great tool to measure In wood and metal working or many other kind rotary device, it can be used to accurately measure the speed of a lathe or any rotating stuff.

The reflective strips which stick on the rotating equipment are mainly used for reflecting the laser signal by the tachometer, so that the tachometer can accurately receive the signals of rotating equipment.