• Two minutes ago my jaw dropped when you said tenth place digit; I assumed you meant better than +/- 0.1 degrees centigrade accuracy. Re-reading it, I was hoping you actually meant +/- 1.0 degrees centigrade. The reason my jaw dropped is because the research I had done into this prior to today showed that +/- 0.25 degrees centigrade accuracy was really stretching it. However...

    However!

    However! You caused me to look again. And here is what I found! And at a VERY reasonable price for the accuracy too. So, I thank you for your question, you helped me to find something I am interested in too.

    BTW, did you try any changes to your code?
    Is this for an aquarium? 18 is pretty cool for tropicals...

    Edit: There are some with different characteristics here, but all +/- 0.1 degree Centigrade accuracy, and some of them are cheaper!

    P.S. But for such an accurate sensor, you are going to want more accuracy in your analogRead(), you might want a 16-bit DAC, here are the through-holes I could find, some are reasonably priced.
    And here are some 24-bit DACs, they aren't through-hole, but the price isn't too bad. BTW, I've never tried anything like this yet, so it's likely there are things I haven't considered...

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