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Old 03-09-2019, 08:29 PM   #1
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Thermometer readings Celsius and Fahrenheit

I have two thermometers in the same fish tank. One of the thermometers reads in Fahrenheit and one in Celsius. Keeping a temperature about 79-80 degrees Fahrenheit, this would convert to a Celsius reading of 26.1-26.67. However using a Celsius submersible thermometer this reading was 28 plus degrees. Thinking that the thermometer could be a defect I used several other Celsius thermometers only to get the same result. I purchased an inexpensive thermometer with probe able to switch from Fahrenheit to Celsius. The readings seemed to be in line with the conversion table. ( 79 was 26.3 80 was 26.9 ) Anyone know why the Celsius thermometers give a reading about 1 degree higher?

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Old 03-10-2019, 06:55 PM   #2
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Is it digital?
Maybe the algorithm employed by the manufacturer rounds up?
Anything above .50 scales up to the next 1.

More decimal places equals a greater accuracy however, it costs much more!

Really, aim for the middle range for all fish concerned. That way you have leeway in both directions.
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