The Extech 461995 Combination Contact/Laser Photo Tachometer offers both contact (0. 5 RPM to 19,999 RPM) and non-contact (10 RPM to 99,999 RPM) RPM measurement features for use in almost any application. Laser-guided non-contact measuring up to 2 m (6.5 ft) distant for improved safety and convenience. The kit includes wheels for measuring linear surface speed or RPM, 4 AA batteries, 0.6 m (23 in) of reflective tape, a carrying bag, and a user handbook.