The JGB Enterprises Ranco Digital Temperature Controller - Wired is a device that allows you to precisely control the temperature of your fermentation, or a pump on your All-Grain System. To control the ferment temperatures you can place the probe inside the space that is being cooled or heated (often a refrigerator) or you can place the probe directly into the ferment using our Stopper Thermowell (FE612). You can change from cooling to heating mode directly from the digital control panel. When in cooling mode, and hooked up to a refrigerator or other cooling device, the controller turns the compressor on when the ambient temperature rises above your set point. When in heating mode and hooked up to our FermWrap Heater the controller turns on the heater when the temperature drops below your set point. A FermWrap around a fermenter or inside a unplugged refrigerator can be the ideal solution for those cold winter ferments. To control a pump when mashing you would install a thermowell in your mashtun. The unit features an adjustable differential down to within one degree in both heating and cooling modes. This means you can precisely control an environment to within one degree of your set point. The included sensor probe monitors the temperature while the digital readout displays it in either Fahrenheit or Celsius. The sensor probe is 1/4" in diameter and works well with the Stopper or Coupler Thermowells. Its Temperature Range is -30° to 220° F.