The Extech 461830 is a digital StroboTach tachometer. Freeze motion and analyze rotating objects without contact.
Perform tachometer RPM measurement, stroboscopic speed and motion analysis with the Extech 461825 Combination Photo Tachometer and Stroboscope.
A tachometer is a device that measures the angular speed of a rotating shaft in terms of revolutions per minute (RPM).