Review on 🌡️ Large Dial Refrigerator Freezer Thermometer - 4 Pack for Effective Temperature Monitoring by Jason Williamson

Calibrated against a digital reference thermometer, two out of four thermometers were almost within +- 1 deg C. One was off by 2 deg but fairly consistent. Only one of them had a different slope that was the most difficult to use. I ran a linear regression on the data and compared the results to readings taken at sub-freezing temperatures and the numbers agree fairly well to within +-1C. So I put this regression calibration data in a spreadsheet just for the sake of convenience. So all 4 devices are very useful. The one with a slope other than 1 is not so good. But the measurements are consistent over time and the calibration data is fine. For the price I give full 5 stars for its value.