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A laser pen is composed of a laser diode, a battery, and possibly a lens. Many laser pointers are red or green lasers, depending on the quality. Red lasers are less powerful than green lasers in terms of intensity, because green lasers operate at higher frequencies, which gives them more energy...

I'm a teacher, I want to buy a laser pen for teaching, which color is better for my class? green laser pen or red laser pen?

Hi,everyone, my name is bowen, I'm a psychology teacher in a private college, In my spare time, I like reading, learning new knowledges in forums, travelling, watching games and shopping on line! I checked with this site for a while before I joined. Now I find that I start getting interested in...