What it is?

Probably an easy one.

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This thermo was in with a bunch of yard sale stuff.
Any body know its application.??
In F only
There is a hole in the bottom of the tube, when its assembled you can just see the bulb there.
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Fly fishermen will quite often use a thermometer like that. They hang it by a lanyard through the hole in the cap.
 
But it wasn't when you left?
Nope, they turned that place into a copier center, none of the stuff we taught was there anymore. small presses are replaced by copiers which are faster and do just as well. I had two huge copiers that would print both sides of a page and collate it and stitch it into a book in one operation. also would fold it if you printed on 11x17. The dark room shut down and developing film was a thing of the past.