William Johnson

do a search dood!
there is a big thread than explains all--asking w/o searching first is very frowned upon here..going now to see your intro thread in Ther welcome section and whats at your profile-- we really NEED to know your location or we cannot help.

Recently wanna a green laser, what's the difference between 532nm and 520nm, why the price differs?
If anyone can help, I would much appreciate!

Hello, everyone, I am the new member and want to know more knowledge about lasers, I heard the forums and joined it.