Sorry, I look into the English forum only seldom. Be so kind, to make an english notice into the German forum or do send me an private mail.
In a private laboratory (home, cellar) you are allowed to use lasers for your own. It seems you are using the laser (class 3R according to IEC 60825 part 1) to show some geometrical figures in front of something like a school class? For educational purpose only lasers of class 1 up to 2M are allowed (please look here
). That is what I remember also.