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Don't go to work if you've had a fever in the last 24 hours.
"CDC recommends that people with influenza-like illness remain at home until at least 24 hours after they are free of fever (100° F [37.8°C])"
I had been wanting a concrete guideline like that.
What thermometer should I get?
I had been wanting a concrete guideline like that.
What thermometer should I get?

There are two basic digital kinds
If your ear canals are oddly shaped (as is true for my younger son) then you will get readings that are too low from the in-ear and will want the under-tongue. It's accurate but much slower.
My kid's pediatrician claimed that about 1 in 10 people have this problem with the in-ear thermometer.