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Johnson Controls Digital Temperature Controller (A421)
Johnson Controls Digital Temperature Controller (A421)
Ideal for keeping the temperature controlled during fermentation, the Johnson Digital Temperature Controller overrides the internal thermostat, keeping the temperature exactly where you set it in either a heater or freezer. A must for homebrewers wanting more control over fermentation. Easy installation, just plug the controller into an outlet, then plug your appliance into the controller.
Price: $129.99

Availability: Usually Ships in 24 Hours


Johnson Controls Digital Temperature Controller (A421)

  • Use to heat or cool a fermentation environment
  • For use with a refrigerator or freezer, it operates compressor when ambient temperature rises above your programmed temperature
  • For use with a heater, it activates when the temperature drops too low
  • 1/4" OD Sensor probe monitors the inside temperature while the easy-to-read LCD display shows it in either Fahrenheit or Celsius
  • Includes 6' extension cord with plug and 6' sensor leads
  • No additional wiring for installation is needed
  • 120 VAC line voltage
  • Range: -30° F to 212° F
  • Differential: 1° F to 30° F (you choose how much the temperature will vary from what is programmed)
  • NEMA 1 enclosure, suitable for dry environments

A421 Series Features:
  • Backlit display makes reading the temperature easy even in low visibility areas.
  • High and Low Temperature stop values allow you to set when the unit heats or cools.
  • Internal defrosting settings.

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