The temperature range for this temperature controller is -40-110. With HD LCD display and 4 buttons. It is a relay temperature controller, you need to connect additional power supply for the load. High power: 220V 30A. It can be used for high power equipment, like refrigerator, brooder, incubator, Fermenter, Greenhouse, etc. Connect power supply and heating/cooling equipment, place the probe and set the temperature, it will work. Heating Mode 'H' : when the detection temperature is less than set temperature - hysteresis temperature, the relay is turned on, and the heating equipment starts to work; When the detected temperature reaches the set temperature, the relay is disconnected and the heating equipment stops working. The principle of Cooling Mode 'C' is the same. Delay 'OPH': When a heating or cooling job is completed, the system starts timing 'T'. When T reaches OPH, the system can start the next round of heating or cooling work. Temperature Correction 'OFE'(-10.0-10.0): When the system works for a long time, there may be deviations, which can be corrected by this function. Actual temperature = measured temperature + calibration value. When the actual temperature reaches the alarm temperature, the system will turn on the sound and light alarm and disconnect the relay, press any button to stop the sound and light. Use Steps: 1. Connect sensor to controller. 2. Connect power supply to controller. 3. Adjust Temperature, Stop temperature and Temperature Correction. 4. Remove power supply. 5. Connect to load with power supply at relay output terminal if needed. 6. Connect to power supply for controller again. 7. Test and run. Material: plastic Package Contents: 1 x XY-DT01 Digital Temperature Controller