Wide application: suitable for all kinds of seafood machines, HVAC compressors, freezers, refrigerators, air conditioners, fermentation chambers, chest freezers, water chillers and other equipment that requires automatic switching between refrigeration and heating. Calibration function: temperature calibration, you can calibrate the temperature as needed. The digital temperature controller is worth buying. Good practicality You can select the cooling or heating working mode. This temperature controller keeps your different environments within the ideal temperature range. Temperature control range: -50-110C. Control accuracy of 0.1 degrees Celsius. Input power: DC 12V. Output: capacitance 20A 12V relay contact. Safe to UseYou can set the highest/lowest upper limit temperature to avoid accidents. High temperature alarm, when the measured temperature reaches the set temperature, the controller will alarm.