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Both temperature controllers operate by overriding the internal thermostat in a refrigerator or freezer and gives the brewer greater control over the fermentation. The digital controller has a digital display with adjustable differential. It can be used to heat or cool a fermentation environment - when hooked up to a refrigerator, it turns the compressor on when the environmental temperature rises above your programmed temperature; when hooked up to a heater, it activates when the temperature drops too low. A sensor probe monitors the temperature inside while the readout displays it in either Fahrenheit or Celsius. This is the ideal choice for lager brewers who include a diacetyl rest in their fermentations or for ales like altbier or Kolsch that require fermentation temperatures in the low end of the ale range.

  
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