Will this test for THC in the atmosphere and up to how many feet?

No...it detects THC residue on surfaces not THC air particles

Would this test residue from a wall of a room that I suspect someone is smoking in?

Only if you can see the residue on the wall itself, or take a cotton swab and get off some residue to use for testing. windows are also a good place to check for this

I have a smell in my condo that I cant tell if its mold or marijuana. Can this test tell me if the neighbors are smoking marijuana?

It tests surfaces for trace amounts of THC...not trace amounts in the air

Can this be used on hands to see if a student has recently smoked?

Yes...on any surface including hands

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Residue Detection THC Drug Test Kit - Rapid Surface Residue Detector, 1 Test

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