This is probably a very stupid question but I'm having trouble finding an answer online. I just purchased a Taylor tru temp meat thermometer, it's not digital and oven proof (I think/hope). I was cooking a 1.5lb turkey breast. I did not put the thermometer in before cooking, but took the turkey out to check the temp midway through. Then I left the thermometer in for the remainder of the cooking time. After checking and seeing it reached the appropriate temp, I took it out to rest. The temperature started dropping immediately after I took it out of the oven, which made me worry that the temp that it read inside the oven was not correct, and it was only the resting temperature which I should look at. After cutting into the turkey breast, it looked done (and it it had been in the oven for enough time that it should have been done), but I was paranoid that I was eating undercooked turkey throughout my meal.
My question is: what temperature should I be reading? The one in the oven? Should it have dropped so fast out of the oven? Do I have a defective thermometer?
Any insight would be much appreciated.