Digital tachometer is handheld unit and accurately measures rotational or surface speed as well as length. It comes with a large LCD display that allows the user to easily read the measurement. It also has a built in memory function that permits automatic storage of maximum, minimum, average values plus the last measurement displayed. The TACH20 is supplied with all the necessary accessories designed with optimal mechanical stability to ensure accurate, reliable and repeatable measurements. In addition to the mechanical adapter that accepts a variety of tips, as well as the surface speed wheel for contact rpm measurement, the TACH20 can perform non-contact measurement by using the infrared beam function. Functions include Rotational speed measurement, surface speed measurement, length measurement.