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    Is my laser lens dirty?

    I don't know if my lens is dirty, the beam is straight but there is a 'X' at the dot I had used the search the forums. But non of them had experienced mine. So guys any comments? And how to clean it?
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    Things to take note when buying lasers?

    Hi im new to lasers and this forum. Just a few question to ask. Im buying a blue laser tomorrow, it is a 1200mw blue laser. The seller said that is it around 437nm-457nm. It is a custom made laser and i would be meeting him tomorrow. I do not own any lasers yet. So just to ask if there is any...