Extech 461831  

461831: Digital StroboTach 220VAC, 50Hz

Speed detection and analysis of rotating gears, fans, pumps, and motors

Freeze motion and analyze rotating objects without contact. The 461831 checks and analyzes motion and speed by simply aiming and synchronizing its flash rate (FPM) with a rotating object ideal for measuring the speed of moving gears, fans, pumps, motors and other equipment used in general maintenance, production, quality control, or laboratories.