I had a theory that my oven was running cold. This was based on an observation that everything takes much longer to cook than recipes say. This is true across multiple types of food, and has been observed by several people. Yesterday, I borrowed a Fluke thermometer with a probe from a friend who works in a science lab and.... if anything my oven runs hot?!?!? I'm sitting here watching the temperature oscillate from a little below to somewhat (10 degrees) above the target temperature.
So, what is going on and can I fix it?