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    The batteries' struggle

    I recently bought a 532nm green laser from ebay, and it came without a battery. I tried it with my ecig's 18650 3.7V Li-ion battery and it seems to work like a charm, although I later found out it's supposed to be used with 2 16340 3.7V batteries (the contacts are a little loose so sometimes I...
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    Safety goggles recommendation

    Hi all! I recently bought 2 pair of goggles off amazon, but learned trough another thread I opened that they're basically useless for my purpose, so I'm refunding them. I already own a green laser which I assume is in the 80~200mW range and just now bought another blue one claiming to be 2...
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    Tips on how to use my new laser safely?

    Hi all! This is my first time posting here, I've been following this community for a while (got to know this thanks to styropyro) and yesterday I finally got my first laser "pointer" delivered. It's a green (532nm) class 3 laser and the sticker says the output power is "under 5000mW" (duh). I...