If you want one that can look at rocks, that one won't work. You need one that's a "dissecting microscope" and it willtypically have much lower magnification. (like 20x) Still very cool. I actually had forgotten about them until we saw one while I was at college reunion. They had flowers in there.
I also forget how old your son is, but if he's on the younger side, you might want to consider one that has a projection screen and/or the style that has two things to look through, as the "wink" is hard to do.
