Amazon.com: Digital LED Counter Count Up to 9999 Laser Sensor 4in Digits Display Counter People Visitor Counter with Remote Control 110-240V : Industrial & Scientific
People Counting | Teledyne FLIR
Single Side Laser People Counters
Single Side Laser People Counters
Wireless People Counters
Door counter with 8051 (89c51,89c52) microcontroller
How to make a LASER PEOPLE COUNTER / laser security alarm - YouTube
Amazon.com: Digital LED Counter Count Up to 9999 Laser Sensor 4in Digits Display Counter People Visitor Counter with Remote Control 110-240V : Industrial & Scientific