I mentioned it up earlier but I did try out a simple battery digital min/max thermometer, but every time you opened the door the air temperature would rise abov

I mentioned it up earlier but I did try out a simple battery digital min/max thermometer, but every time you opened the door the air temperature would rise above 40F (highest recommended temp to store dairy), which made it hard to use for the intended purpose! If the thermometer had more thermal mass attached to it (or simply had a low pass filter on the readout), it would have worked great. I also had an analog thermometer at one point, but obviously the problem here is if the power goes out, then comes back on and returns to the proper temperature. It should be a simple thing I agree!