Anyone know where I can get one. None of the usual suspects have them listed.
[/quote]
Mashmaster sold a separate probe designed to go into your wort which gives more accurate temperate control. Can't see it listed but it is pictured with DEI-105 Fridge Controller Kit
They should be a standard NTC probe. You can pick them up from a lot of places. I use Heatcraft as they are close to the brewery.
If you look under the price guide section on here - Heatcraft Site - you should find what you are looking for.