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) speed measurement capabilities for use in virtually any application. Laser guidance for non-contact measurements from up to 2 m (6.5 ft) away for added safety and convenience. The wheels are ideal for linear speed or rpm measurement. Included are four AA batteries, 0.6 m (23 in) reflective stickers, a carrying case and a user manual.