Review on 🌡️ Thomas 4239 Traceable Refrigerator Thermometer with 2 Bottle Probes, Hi-Accuracy, -58 to 158 degrees F by Jim Bijelic

I am using it with a two bottle sensor to calibrate the temperature controller offset for my built in Perlick fridge. I originally thought a 1 vial probe might be enough, but I'm glad I bought the 2 vial version instead. The temperature difference between the top and bottom shelves is between 2 and 4 degrees, even though the refrigerator has a circulating fan. I was able to set the differential perfectly so the soda cans on the colder shelf wouldn't explode while the warmer shelf was slightly above freezing.