I am doing some experimentation, for a science fair. And I want to make sure I the laser pointer I use is Class I (conceivably, I may change that, but any class of laser can be used to replicate results similar to the double slit experiment correct?). Can any one direct me as to where I may be able to get one? Are commercial laser pointers generally class 1? I could test them to see, by measuring output and all that, but I'd prefer not to go through that much effort if I can just get one that I know is of the correct class. Thank you for any help, and sorry if this is in the wrong sub-forum, I didn't see any more appropriate.