I'm finally getting around to setting up my brewbit. What is the best way to read the temperature of a carboy? Do you just tape the probe to the outer wall? Is this accurate and does it provide quick enough feedback?
A thermowell would be the most accurate http://morebeer.com/products/hood-thermowell-3-5-6-65-gallon-smooth-neck-carboys-15.html
Taping to the carboy works, but you will get better accuracy with a thermowell (and if you got a device with the accuracy and resolution of the brewbit, why wouldn't you want accuracy), your best bet is a thermowell
Yeah, thermowell is a good option, but we generally just do as you said and tape the probe to the outside of the carboy. Not sure how much temperature difference you will get, but it works well enough for us.
If you're gonna tape to the side of the carboy, I'd hide the probe under a piece of insulation. I deconstructed a $1 thermal bubble envelope that I picked-up at my local Staples. Prost, Jeff