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If the temperature goes out of acceptable range than then it is defective. The only people who need that plot are the lawyers for the class action lawsuit for a defective appliance.

There are scientific reasons to need the plot, but that is not normal and they likely need a special fridge with tighter controls or something anyway.

I’d just throw an analog min/max thermometer in there and investigate if the max temp goes above 40F, sounds a lot easier than adding a temp probe and door switch to a residential refrigerator.

There is already a door switch in all the refrigerators I have used. It controls the light (at least I think it does, I have never seen the light go off:)

Close the door very slowly. If you do it right, you'll see the light turn off.

Or, y'know, press the switch yourself.

Oh yeah, I forgot about the built in door switch, good call XD

If there is a door open sensor there should be a close door function.