On Tue, 26 Apr 2005, Bob Blick wrote:

> Thermistors are fragile, it could be damaged, they can act like that when
> cracked or under mechanical stress. Or if it is potted, there could be
> some trapped moisture, or corrosion.
>
> Drift should be negligible if working correctly. Error of two percent
> total for aging and accuracy combined for the lowest cost parts.

Thanks, I will check another unit. I buy all parts in pairs for that 
reason but this one's pair seems to have escaped ...

Peter
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