I just told you it, above. Chemistry, Armor/gearbuilding, lab safety, general sciences (as in shit you'd learn at school)
The Average Joe would learn Lab Safety in school, but would most-likely forget it. Since George Tennerman is a Chemist, and literally has to do that everyday since it's his job, he'd be very good at it. Chemistry is his skillset, he'd be very good at it (since it's literally his job, and he'd studied and practiced it so many times.) Armor/gearbuilding (because his armor/suit practically calls for him to be good at updating and making other armors/technologies for other people.)
Don't shitcan/throwaway the app. I've tried so hard to address your complaints/issues.
I had to specify "that's his skillset" since the co-OP tried tearing me a new asshole there by saying: "Partly going with the above, what does Chemistry/General Science ability entail? If it's that he understands it well, what's the Powers section mean?" earlier.
It's not that I'm being vague or anything, it's that I feel like y'all are misunderstanding me or that char/app. I feel like I'm saying the same damn thing several times. (Y'all asked me what can Tennerman's suit do, I gave you the answer. I got that. I'm not trying to say that y'all don't understand. I get why y'all asked.)