The ThruMometer™ from Blichmann Engineering™ is the first in-line thermometer. It's the ideal for monitoring wort temperature as it goes from your counterflow wort chiller to your fermentation vessel. Conceived especially for brewing, all interior surfaces of this thermometer are mirror-smooth, so there is nowhere for bacteria to hide, and it is easy to sanitize. Quick responding, the ThruMometer™ thermometer responds at the rate of 1 degree per second. Accurate to within 1 degree. Never needs calibrating. Used with any counterflow wort chiller (cannot be used with immersion chillers), the ThruMometer will help you avoid over-chilling your wort, and save water. Constructed of heat-treated corrosion-resistant aluminum alloy, will last a lifetime! Tubing with an inner diameter of 3/8 inches will fit the thrumometer.