General description Sealey Contact/Non-Contact Digital Tachometer is a professional quality laser instrument designed for fast and accurate measurement of rotational speed, both with and without contact. It can also measure total revolutions, frequency, surface speed, and distance. Technical specifications Model No.: TA050 Powered by 9V battery (supplied) or 6V DC auxiliary transformer (not included) 10 selectable data set memories Compatibility and accessories Supplied with reflective tape for non-contact measurement Includes three heads for contact measurement Other information