I don’t think they have measuring devices like that in my library, but sure, that and a geiger counter would be useful. For ecology and saving on the bills, people could make use of energy meter plugs. Or maybe a thermographic camera. Maybe iFixit kits and some tools for people who don’t have them at home. And I’ve seen libraries offer outdoors-games like Kubb and music instruments. I think that’s nice, especially for kids and young adults.