UT 371Series Tachometers

https://martpakistan.com/product/ut-371series-tachometers/ 

 

this electronic product is very useful in measurment

UT371 series non-contact tachometers measure rotating speed of shaft or disk with a point laser and reflective tape on the object being measured. These meters can output RPM or count readouts without interfering with the equipment being measured.