Uhhh, yup. (Sigh)
I've been watching it ever since R2B brought it to my attention in a PM a few weeks ago. I've got a few months to think about it, potential causes, etc. That's because I won't be able to swim down there and visually inspect it until that season is back. Will be interested to see if it straightens out during the winter, or in the start of swim season. Last time I doubted its reading enough to check it, the season was summer and I swam down there. My nerve endings confirmed the reading and the temperature difference that the two probes were showing at that time.
If anyone has any guesses about the cause (other than calibration, the obvious) feel free to speak!
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