The Fermonitor is a digital instrument that continuously monitors the progress of batch fermentation (up to 4 fermentations at once). The instrument conveniently interfaces with a PC to allow users to keep a close eye on yeast activity, %alcohol, %sugar, %attenuation and specific gravity. Batches can be saved and catalogued for future reference. The Fermonitor® greatly enhances the brewing experience while also quenching the brewer's thirst for more information during this critical, but sometimes "mysterious" stage of the brewing process.