Thermistor is the best way. Thermistors are much more accurate than they appear
to be from specs. E.g. 10% thermistor will have only about +/-2 deg C error from
the theoretical calibration point and most thermistors sold now are better than
5%. Digital calibration is easiest. Analog IC sensors seldomly reach real +/-0.5
deg C at three times the price level.

Peter


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