Could likely get a fridge thermostat and wire that in with the relay, but there is probably no gain to be had for the trouble. The freezer only needs to run two hours to pull the meat from +4 to 0 c and then it takes a whole day to come up to +4 again. A simple timer plug would work to do 2hrs every 24. I have a Delta Track refrigeration thermometer that I put in the freezer and just did a visual check on temp
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