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Non-burning lasers with visible beams?

phlynx

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Are there any cheap ones? ($25 or less) Could you put a filter on a walmart one that makes it visible? I don't want to buy fog machines or anything.
 

billg519

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With power comes visibility.
Filters do not make a laser more visible.
For 5mw lasers, you need fog, a smoke filled room, a blizzard at night, or run the vacuum cleaner backwards and fill the air with dust.
Otherwise, you need laser power or a fog machine.
A 5mw green can be seen indoors in subdued lighting. (Assuming you don't run a HEPA furnace filter)
 




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