I've found (in my brew cupboard which is not yet insulated) that if I set it to 18.5C with a 1C swing either way it is sitting at around 18.5C every time I open the cupboard so it's perfect for me! I have the 12" probe dipped into my FV.
How did you enable this? Did you drill another hole in the lid and add a rubber bung/seal to pass the probe//cable through?
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