The digital airlock Plaato allows hobby beer brewers to digitally monitor the alcoholic fermenting process. During the fermentation process CO₂ is released, which escapes via the airlock and is captured as a data set. The data are directly transmitted to an app, including density ratio, fermentation activity, alcohol content and ambient temperature. In order to minimise the risk of contamination, the airlock does not come into contact with the beer. It is also detachable and easy to clean.