Wawa:
A digital DS18B20 has a resolution of 0.0625°C, and is factory calibrated to 0.5C.
The waterproof version already has a cable attached.
Several can exist on a single digital pin from the Arduino (OneWireBus).
Leo..
I know. I alredy used them and are they really good and cheap.
That would be my second choice as I'd need to replace the probe and it might be difficult.
But thank you all for the great support and learning.
Andrea