Most are Accurate
This set of 12 identical dial thermometers are well constructed from stainless steel and have a dial indicator that is easy to read. I tested them out at room temperature and refrigerator temperature to see what the accuracy / variability was for the set. For a device of this type, I consider measurements that are +/-5% of the actual value to be acceptable.For the Room Temperature test, I set them on a stone countertop in the bathroom and allowed them to stabilize for several hours. I placed an Omega digital thermometer with a K-type thermocouple on the countertop with them to use as my reference standard. The digital thermometer measured the temperature to be 72.9F and the 12 thermometers measured from 66F to 72F, for an average of 69.8F. I listed the values in the TEST DATA table from smallest to largest. NONE of those 12 matched the digital thermometer, although 9 of the 12 were within 3-degrees (5%) of the correct value.For the Refrigerator Temperature test, I placed them within the cold section of a two-zone beverage refrigerator and allowed them to stabilize for several hours. This time, the refigerator’s internal thermostat provided the reference temperature of 41F. The 12 thermometers measured from 35F to 43F, for an average of 39.9F. I again listed the values in the TEST DATA table from smallest to largest. This time, one of those 12 matched (highlighted in green) with three being hotter and eight being cooler. This time 11 of 12 thermometers were within 2-degrees (5%) of the 41F reference temperature.Both times, the lowest temperature reading came from the same thermometer (“T1”) and it was more than 10% different vs the reference temperature, which is not especially great performance. One can of course just avoid using T1 - The others are accurate enough for monitoring refrigerators and freezers – however, one out of twelve is not up to standard, which reflects badly on the set. I am therefore deducting one star for the poor performance of that thermometer.