I was wondering if anyone has experienced differences from the temp displayed and the actual temp of fermenting wort. As we know a fermenting wort can be exothermic, as much as 5-10 degrees. When using the brewjacket, immersion cooler and temp probe, I am wondering how accurate it is.
Basically I want to know if I need to set the temp at 60-62 to ferment at 66-70. I have had it set at 67 & 68 for the first few brews and fear it may be fermenting over 75 as I had some fusels.
I have yet to do a study as I do not want to oxygenate or risk infection by taking reading. Any info or insight would be helpful.