That is quite common with the big air bubble caused by the probe being sandwiched air is a ok insulator so that explains the differences. My ultratherms vary about a degree from the highest to lowest temp I can find but I don't sandwich the probe either. I would expect variation with a sandwiched probe. Also does the probe and thermometer read the same? You could be seeing variation due to discrepancy as well, I have been told the specs on the VEs is +/-1ºF but have never seen documents to support that.
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