Einbrew 4F - Fermentation ControllerEINBREW 4F 1 4 VESSEL FERMENTATION CONTROLLER UK Designed, UK Manufactured, UK Supported. Controlling the temperature of your FOUR fermentation vessels is easy with EINBREW 4F. Full fermentation cycle management and temperature control. The 4F lets you program the desired temperature for each of your tanks, it will show the fermentation time in hours and will manage crash cooling if you wish. Bespoke electronic controller with process management to