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I have a heater for my fish tank with its own built-in temperature display.
But because I want to know whether the temp displayed is accurate, I bought a a second standalone thermometer. If the two numbers match, then I know the temp is correct.

Well, now both are showing two quite different numbers. I couldn't tell which one is malfunctioning, and so now I have to get a third thermometer 😥

#AquariumDiary