You can get the 18B20 sensor potted in a stainless steel housing, maybe you
> could just bury one or two of those in the ground. There are plenty of
> vendors,


Another random vendor of what appears to be the same product:
http://www.mpja.com/10-12-15.asp?r=3D338600&s=3D36
I suppose it depends on which side of the "pond" you're on.
-Denny
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