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Wow, the one in your original Ebay link is $107 whereas I just bought one
that looks exactly the same from Ozlasers for $20.
My old one (that looks the same as these) has gone very low output for
some reason.
The byproduct IR scatter has always worried me with these cheap lasers
so when I mount it on my EQ6 (as an alignment tool) I will put it inside a
piece of 20mm conduit with an end cap, and just have a small hole for
the beam to come out. That way any scatter won't come out, and any
bad spectrum energy will only be coming directly out the front where
you don't look.
Cheers,
Jason.
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