Amprobe tach20 tachometer amprobe tach20 the amprobe tach20 hand held tachometer 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 br br br the tach20 is supplied with all the necessary accessories designed with optimal mechanical stability to en