Bru Success®: Fermentation Temperature Control KitIt only takes one temperature swing to wreak havoc on your fermenting beer. Make sure your next brew is a success with the Bru Success Temperature Control Kit. We've assembled everything you need to keep your yeast comfy to produce the best beer possible. At the heart of this kit is the Northern Brewer Dual Stage Temp Controller and the Fermotemp Electric Fermentation Heater. Together, they will keep your fermentation at the exact temperature you set,