We had an old meat thermometer for years, and may still have it. My wife complained that it was too hard to read. I suggested that you just insert it an turn it until the desired temperature was at the top of the dial. “Noon” indicates ready to eat. We had used it for years.
My daughter got my wife this one this year, because of the “hard to read” thing. BTW, the instructions and packaging are in the trash. I did read the instructions and did not notice anything [prominent] about not placing it in the oven.
Plastic case and liquid crystal display probably ought to have given a clue even without a specific instruction ... but I admire your courage for posting this!