When we bought our house, the home inspector said the oven temperature
was hot +25 degrees. We never thought of testing it ourselves since it
was just tested -- but recently, we called the home warranty before it
expired and had it tested again. He said it was accurate (not too hot).
He said we can test it ourselves by buying an oven thermometer, and
that we should be sure to buy a mercury one because it is more accurate
(suggesting that the inspector did not have a mercury-based one).

First, I didnt know thermometers could NOT work without mercury -- I
never see thermometers advertised as "mercury-based' or otherwise.

So what do you suggest for testing the oven temp? We were left with the
feeling of having to prove the home warranty guy wrong.

Thanks for any tips,
Tim