Response to (OT)Accurate color thermometer recommendation

Can I just add that even a calibrated liquid/glass thermometer won't be accurate unless it's used properly. Some have an immersion line engraved on them, and this type is only accurate at one specified air temperature.
If there is no immersion line, then the entire mercury or spirit column should be in the liquid to get the correct reading. Not terribly convenient in a deep tank!
My mercury certified thermometer gives 1/2 deg F variation between simply dipping the bulb and fully immersed.

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