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Inkbird Dual Stage DV 12V Digital Temperature Controller Fahrenheit Thermostat Heating and Cooling for Homebrewing Brew Fermenter Fridge Incubator Greenhouse auspowers_batchfour Fits: Most Black & DeckerInkbird Dual Stage DV 12V Digital Temperature Controller Fahrenheit Thermostat Heating and Cooling for Homebrewing Brew Fermenter Fridge Incubator Greenhouse Product Features Output2 Relays, control the temperature by setting the temperature set value and the difference value. ModeAutomatic switch between cooling and heating modes, Fahrenheit and Celsius display can be choose. CalibrationTemperature calibrating, refrigerating control output delay