[Simple to Use]: This temperature controller features a range of -40°C to 110°C. Easy to set and adjust with an HD LCD display and 4 buttons. It is a relay-type controller; an additional power supply is required for the load. [High Current 30A Relay]: With a high power rating of 220V 30A, suitable for high-power equipment such as refrigerators, brooders, incubators, fermenters, and greenhouses. Connect the power supply, heating/cooling equipment, place the probe, and set the temperature to operate effectively. [Heating/Cooling Function]: Heating Mode 'H': When the detected temperature is ≤ (set temp - hysteresis temp), the relay activates to start heating; when ≥ set temp, the relay disconnects to stop heating. Cooling Mode 'C' follows the same principle. [Delay Start & Temperature Correction]: Delay Start 'OPH': After a heating/cooling cycle, the system times 'T'; next cycle starts when T ≥ OPH. Temperature Correction 'OFE' (-10.0-10.0): Corrects long-term measurement deviations (Actual temp = measured temp + calibration value). [High Temperature Alarm]: When actual temp ≥ alarm temp, the system triggers an audible/visual alarm and disconnects the relay; press any button to stop the alarm. Use Steps: 1. Connect sensor to controller. 2. Connect controller to power supply. 3. Adjust start temp, stop temp, and temperature correction. 4. Disconnect power supply. 5. Connect load to relay output terminal if needed. 6. Reconnect controller to power supply. 7. Test and operate. Color: As shown. Material: Plastic. Package Contents: 1 x Digital Temperature Controller. Note: Color may vary slightly due to lighting and display differences. Allowable measurement error: ±1-3cm.