In this video I build one of the most difficult DIY lasers, the "pen" laser. This laser is incredibly small and runs on 2x AAA batteries, but still packs quite a punch and burns many objects! Text overview of this build:
Check out to learn more about laser pointers, lasers, and laser pointer companies! I have been a member there for 8 years, and have received a bunch of help from the knowledgeable members there!
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