The Extech 461830 is a digital StroboTach tachometer. Create accurate motion snapshots and analyze rotating objects without contact. Checks and analyzes motion and RPM by simply aiming and synchronizing the flash frequency (FPM) with a rotating object. Ideal for measuring the speed of moving gears, fans, pumps, motors and other devices used in general maintenance, production, quality control or laboratories. The scope of delivery includes a 1.8 m power cable, a handle and a tripod mount.