I work in a steel mill. I do the chemical and physical testing on our products. In the past we could only test low alloy steel. Now we have a machine that will read most of the elements so I've been able to test some brass and aluminum. I can also test oxides like lime and silica. I can't set up any kind of testing business but I can do a few samples for friends now and then.
I forgot the lead last night, that's from my other hobby, letterpress printing. Like I have time for two hobbies and work 60 hours a week. Oh, and I forgot fishing, which I've only got to do a few times this year.
This is our machine, pretty cool CSI kind of stuff. We aren't even close to using it to it full potential.
www.bruker-axs.com/s2_ranger.html