When wort is too cold, you get long lag times and increased opportunities for bacterial infection. When it’s too hot, off-flavors can form. Blichmann Engineering’s patented ThruMometer™ lets you get it just right – letting you adjust wort and water flow rates in your counterflow heat exchanger to dial in an exact temperature, with no more guesswork! Available to fit 3/8" ID hose and 1/2" ID hose. Plus, use only the water you need – good for the environment and your wallet!