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If it varies when moved, then it probably has a spot where the wire is almost broken (high-resistance open).

You could buy a replacement K-type probe, even one with a beefy stainless tip. I had the same failure trouble with beaded tip probes... mine didn't go bad right at the tip, but an inch back where it rubbed. There's a thread around here somewhere with pictures of a steel tube running into the roaster to protect the thermocouple. I've searched but can't find it. The tube was part of an ink pen.


CHAD