Hydrofarm Jump Start Digital Temp Controller

Hydrofarm Jump Start MTPRTC Digital Controller Thermosta, 9-by-19Inch

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Provides constant optimal temperatures for germination/rooting
Ideal in homebrewing for maintaining desired fermentation temperature, and perfect for temperature control in reptile terrariums and small pet enclosures.
LED heating indicator light and Digital temperature control
Controllable range of 68°F – 108°F, Choice of Celsius or Fahrenheit readout (press Up or Down button to change)

Note that this temp controller is for heating only. With a range of 68 to 108 degrees this would generally be in the ale range. A controller like this may be helpful for maintaining fermentation temps in cooler weather.

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Hydrofarm Jump Start MTPRTC Digital Controller Thermosta, 9-by-19Inch

Also Consider: Itc-308 [Hands on Review] | Homebrew Fermentation Heater | Resource Post: Maintaining Fermentation Temps in Colder Weather