Usage Tips:[Simple to Use]:The temperature range for this temperature controller is -40-110. Convenient to set and adjust, with HD LCD display and 4 buttons. It is a relay temperature controller, you need to connect additional power supply for the load. [High Current 30A Relay]: High power: 220V 30A. It is can be used 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 great. [Heating/Cooling Function]: Heating Mode 'H' : when the detection temperature less than equal set temperature - hysteresis temperature, the relay is turned on, and the heating equipment starts to work; When the detected temperature greater than equal the set temperature, the relay is disconnected and the heating equipment stops working. The principle of Cooling Mode 'C' is the same. [Delay Start &Temperature Correction Function]: Delay Start 'OPH': When a heating or cooling job is completed, the system starts timing 'T'. When T greater than equal OPH, the system can perform 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. [High Temperature Alarm Function]: When the actual temperature greater than equal 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 to power supply to controller. 3. Adjust Start Temperature,Stop temperature and Temperature Correction. 4. Remove power supply. 5. Connect to load with power supply at relay output terminal if need at Step5 in. 6.Connect to power supply for controller again. 7. Test and working color:As shown Material:plastic Package Contents: 1 x XY-DT01 Digital Temperature Controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.