The QTR-1A reflectance sensor carries a single infrared LED and phototransistor pair in an inexpensive, tiny 0.5" x 0.3" module that can be mounted almost anywhere and is great for edge detection and line following applications.
Every laser needs a holder!
What is a 'laser card' you ask? It is the coolest thing, like all things laser!
This is the basic laser card module with circuitry built in so that it can be turned on/off with a TTL signal.
A very powerful 5mW green laser. Fun, but don't point in anyone's eyes.
Left, Middle, Right short range sensors in a small package.