#10 Silicone Stopper Thermowell itemID-28258 and most of them do

and most of them do so in an Erlenmeyer flask

a nice big starter of Belgian ale yeast should do the trick

sediment free beer

Best if used with Kreyer Masterlog Controller (SDML)

#10 Silicone Stopper Thermowell itemID-28258 and most of them doThis carboy thermowell is used in conjunction with the Digital Controller, FE601A, FE610A, or FE602, to more accurately regulate internal temperature during fermentation. It is exceptionally useful during the start of fermentation when the lag between ambient temperature in the refrigerator and actual temperature in the carboy can vary greatly. Now you can keep your beer or wine within one degree of the set point on your digital controller. Designed