Red Diode Laser Pointer, Lasers: Educational Innovations, Inc.

This Class IIIA red diode laser point is a little different -- press the button to tun on, press again to turn off. Perfect for classroom optics setups where having the beam on continuously is more convenient than having to hold it constantly
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Laser diode hi-res stock photography and images - Alamy

Laser - Wikipedia

Economical laser pointers are useful for many optical experiments. Lasers operate on a push-button switch, are housed in a rubberized aluminum pen-style case, and include a pocket clip. The lasers are Class 3R and are each 6” long x 0.5” in diameter. The red laser pointer has a maximum output of 5mW and a wavelength of 650nm (+/- 10nm). The range of the beam is 100 meters. The expected operating life is 1000 hours. Operates on two AAA batteries (not included).

Laser Pointer, Red

Focusable Red Line Positioning 650nm Laser Pointer Portable Diode Module Battery

This Class IIIA red diode laser point is a little different -- press the button to tun on, press again to turn off. Perfect for classroom optics

Red Diode Laser Pointer

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Class II Red Laser Diode Module (650nm 1mW )-AIMLASER

This Class IIIA red diode laser point is a little different -- press the button to tun on, press again to turn off. Perfect for classroom optics

Red Diode Laser Pointer