With devices like the Tilt, fermenting under pressure with a spunding valve, floating dip tube in the fermenter, and precise temperature control, I gave up needing to look at the beer in process several years ago; but then, along came the All Rounder and voila! I can do it all and watch with a simple fridge door opening for the clearing drop post-fermentation and then rack under CO2 to the purged keg. Of course, none of those are necessary to make good beer, but it is remarkable to see what the data are telling me on the status of a fermenting beer and confirming it visually.