An expert on these things is telling us that
sale of any of class 3B or class 4 lasers (anything greater than 5mW power) is illegal to the public
and yet
alongside that post is an advert for the sale of lasers of
greater than 400 mW.
It's difficult to believe that one is seeing this on a site so supposedly reputable and responsible as PPRuNe. Very few times I am lost for adequate words . . . . . but this is one of them. I have no arguments with the moderators (well, only a couple), but my disgust at the owners/bosses of the site is getting greater by the day.