Extech 461830 Digital StroboTach 115VAC, 60Hz - Speed detection and analysis of rotating gears, fans, pumps, and motors

Features: 

• Checks and analyzes motion and speed by simply aiming and synchronizing its flash rate (fpm) with a rotating object

• RPMs on 4 digit LED display
• High accuracy over a wide, dynamic range via exclusive microcomputer LSI circuit and crystal control time-base
• Ideal for measuring the speed of moving gears, fans, pumps, motors and other equipment
• Tripod mount for stationary use