I have several different ways I can/do measure temperature of my fermenting beer:
- stick-on liquid crystal thermometer on exterior of glass carboy; and [/*]
- digital temperature probe in thermowell; or[/*]
- digital temperature probe on exterior of glass carboy.[/*]
My digital temperature probe is linked to the temperature controller for my fermentation fridge. I usually use the thermowell, except when I’m expecting blowoff, in which case I tape it to the outside of the carboy.
My question is this: has anyone explored the temperature differences between these two or three methods? Ultimately, when I use a blow-off tube, should I be setting the digital controller a few degrees lower?