Digital DC 12V Dual LED Display Temperature Controller Sensor Relay Module Thermostat Switch Features: This temperature controller is designed with dual-color LED display and has high precision of 0.1℃. It supports temperature correction, temperature alarm and delayed start function. Designed with screw terminals for convenient and easy wiring. Water-resistant probe has higher sensitivity, sealed with silicone, more suitable for liquid temperature detection, safe and durable. Widely used for temperature control in cabinets, industrial equipment, vegetable and flower greenhouses, etc. Specifications: Control Range -50℃~110℃ Control Precision 0.1℃ Sensor Input NTC10K water-resistant sensor L=0. 5M Temperature Alarm -49℃~110℃ DC12V Output Type Relay output max. 10A Return Difference Set 0.1~30℃ Delay Start 0~10minutes Temperature Correction -10℃~+10℃ Red Display Measured Temperature Green Display Setting Temperature Instruction: K0 K1 Terminal: Thermostat output type is relay output, K0 and K1 is equivalent to a extension relay switch; 12V power supply powers the thermostat, sensor detects temperature, internal temperature control program control relay output and load (if the load is powered by AC power supply, it is safer to connect K0 and K1 to live wire) Code Function Setting Range Default P0 Temperature Control Mode H(hot)/C(cold) C P1 Return Difference Setting 0.1~30℃ 2℃ P2 Temperature Correction -10~10℃ 0℃ P3 Delay Start 0~10 (min.) 0 P4 Temperature Alarm -49~110℃ 110℃ "SET" Button: Set switch "+" Button: Increase temperature "-" Button: Reduce temperature Restore to Factory Settings: Power on,  press and hold "+" and "-" buttons together for about 3 seconds. P0 Temperature Control Mode: This parameter must be set for first time using controller. If used for heating, set it as H; if used for cooling, set it as C. P1 Return Difference: Press and hold SET button to enter internal setting, select P1 setting, press the SET button again to set return difference value. (Return difference value is the value that controller restarts after it reached set temperature and stopped. For example, if we use heating mode, make controller stops at 40℃ and restart at 35℃, the return difference value is 5) P2 Temperature Correction: This function is used for temperature correction, if there is a deviation between measured temperature and real temperature. Correcting Temperature= Measured Temperature + Correction Value. For example, if the measured temperature is 25.6 degrees and the actual temperature is 25.8 degrees, set P4 as 0.2, so the final temperature is 25.6 + 0.2 = 25.8 degrees P3 Delay Start: This function is normally used for compressor refrigeration. If controller is used in refrigerator freezers, this value must be set. According to back pressure of compressor, this value can be set between 3 and 6 minutes. If you don't use it to control compressor or don't need delay function, you can ignore it. P4 Temperature Alarm: Set temperature alarm value, when the real-time temperature exceeds this value, the display will flash to alarm. Heating mode setting example: Control electric heating equipment to stop heating at 35℃, and restart when temperature is down to 30℃; 1, Press and hold SET button for 3 seconds to enter internal setting, set P0 as H. 2, Press and hold SET button