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The boiling point of water, once corrected for barometric pressure , is a constant. An open pot of water, boiling on the stovetop could serve as a reference to tell you which thermometer is most accurate.
If you know your local barometric pressure, you can google "water altitude boiling point" and find a calculator for the correction.
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-John
'94 968 Iris Blue
'85.5 944 White - Rally Cross and wrenching practice
'84 944 Gemini Grey (gone, but missed...)
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