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FWIW, most thermometers are not accurate across their entire measurement range. Even the better ones that were used to measure temperature for weather reporting included calibration charts to give accurate measurements. In the lab, we calibrated thermometers by determining their reading compared to the boiling points (or freezing points) of known pure compounds like benzene, water, etc. Instead of using an “oven thermometer”, I use a dial thermometer that I can check by immersing its probe in a pot of boiling water. It may be off by 10 or 8 degrees at 400 degrees F, but I know that it is close at 212 degrees F (or not). ;-)

C.J.V. - who has 6 or 5 dial thermometers along with 8 or 7 mercury thermometers
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