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I spent an afternoon researching this, and read a lot of material, but with no successful results. [I really thought this would be a trivial task.]

Is this problem Windows, or WIN10, specific, as the extended characters all seem non-displayable? Regardless, is there a solution?

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The Arduino serial monitor uses UTF-8, per the discussion at http://forum.arduino.cc/index.php?topic=172814.0 --

For the U+00B0 degree symbol, you'd send the bytes UTF8 0xC2 0xB0 like this:

Serial.print("°");

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