The Grainfather Wortometer is used in conjunction with the Grainfather Connect Control Box thermometer, and will allow accurate control of your wort transfer temperature through the Grainfather Counter Flow Chiller.
It will allow you to avoid long lag time and off flavors. Simply adjust your wort and water flow rates from the Counter Flow Chiller by dialing in the exact wort temperature your specific yeast requires. It is made of copper and is covered in a nichrome coating.
It does require a 8 mm inner diameter silicon hose.