ThermoStar Digital Temperature Controller for Precise Beer and Wine Fermentation with a Fridge or Heater The first dual-mode digital temperature controller to go from -50F to 300F. Switch from heating to cooling with the flip of a switch (no need to swap internal jumpers) Responsive dual-color LED display; Red for Heating Mode - Blue for Cooling Mode Optional 12" Modular probe that eliminates the need for a thermowell (Not Included; Sold Separately) Low-profile design outfitted with multiple mounting options. Tested and trusted by our Brewmasters for its reliability and ease of use