The YT853 is a portable digital laser tachometer designed for non-contact rotational speed measurement. It offers a measurement range of 2.5–99,999 RPM and a measurement distance of 50–500 mm.

The instrument features a large five-digit LCD display with backlight, MAX/MIN readings, average and last measured value display, automatic power-off and low battery indication. It is suitable for rotational speed measurement during motor testing, machinery inspection and equipment maintenance.