Temperature measurement range: -50~110. Control accuracy: 0.1 celsius. Double LED displayred + red, precise temperature control, high sensitivity, suitable for any temperature occasion required. OutputThe output is electronically controlled by a microprocessor, to guarantee the highest intervention precision and excellent temperature reading resolution. NTC probeThe NTC probe is waterproof and allows to control the temperature even of fluids, allowing controlled heating or cooling. Refresh rate: about 0.5s. Input power: DC12V. Special Note: The digital display is in degrees Celsius (). Product Description Description: Model: XH-W1219 Control range: -50~110 celsius Control accuracy: 0.1 celsius Measurement input: NTC10K waterproof sensor L=0.5m High temperature alarm: -49~110 celsius Input voltage: DC 12V Output type: relay output 10A (max) Return difference setting: 0.1~30 celsius Delay start: 0-10min Temperature calibration: -10~10 celsius Size: 60*43*16mm how to use: Temperature control mode: when using this product for the first time; if used for heating, please set H, if used for cooling, please set C Return difference setting: long press SET key to enter setting internal, choose setting P1; then press SET key to get the return difference value setting Temperature Calibration: This function is for temperature calibration.If the detection temperature and temperature actual are different, users can apply this function to calibrate Delay start: this function is for compressor cooling Set high temperature alarm value : when the actual temperature is higher than this value, the screen flashes and sounds an alarm Restore factory settings: when the device is powered on, press and hold the + - button for 3 seconds Note: Size for manual measurement, there may be 0-2mm error, belongs to the normal phenomenon. Package included: 2pc digital temperature controller 2pc waterproof NTC sensor