Specification:  Temperature control range: -50℃ ~ 110℃.  Temperature measurement error: ± 0.5℃.  Sensor Model: NTC (10K / 3435).  Control accuracy: 1℃.  Working voltage: DC12V / DC24V / AC220V.  Working current: MAX200mA.  Relay contact current: AC5A / 220V.  Data saved: Yes.  Operating temperature: 0℃ ~ 50℃.  Storage temperature: -10℃ ~ 60℃.  Instrument size: 90mm (length) x 60mm (width) x 26.5mm (depth).  Opening size: 70mm (length) x 50mm (height).  Delivery probe length of 1 meter, probe size: φ4mm x 20mm.     Function:  Control temperature setting:  Press Set button once, the temperature display flashes long press 3 seconds to enter the setup menu, that is, the code HC.  Press △ key or ▽ key to cycle through the code of HC-D-LS-HS-CA-PT-AH-AL. To enter a code, press Set and press △ or ▽ key to change the desired value Exit automatically after 5 seconds.  Heating control: when mode control mode (code HC) is set to H, it is heating mode. For example, set the control heating temperature to 35℃ and the temperature hysteresis to 2 degrees. When the ambient temperature ≤ set temperature (35℃) - back to the difference (2℃) 33℃ relay output starts; when the ambient temperature ≥ set temperature (35℃) relay output is turned off.  Refrigeration control: Mode control mode (code HC) is set to C cooling mode, for example, set the cooling 35℃, temperature, hysteresis of 2 degrees. The relay output is activated when the ambient temperature is over the set temperature (35℃) + hysteresis (2℃) at 37℃. The relay output is turned off when the ambient humidity is below the set humidity (35℃).  HC: mode selection, C for cooling mode. H stands for heating mode.  D: hysteresis, when in heating mode start temperature = display temperature; - hysteresis. Start temperature when in cooling mode = display temperature + hysteresis.  PU: delay start, when the relay stops output starts timing, the interval between the next start must be greater than the delay start time, to avoid frequent start.  HS: temperature upper limit alarm; when the temperature exceeds the alarm upper limit, the digital tube shows 'HHH' temperature is lower than the alarm setting, it will automatically exit the alarm.  LS: temperature lower limit alarm; when the temperature exceeds the alarm lower limit, the digital tube will display "LLL" temperature is higher than the alarm setting, it will automatically exit the alarm.  CA temperature calibration: temperature calibration straight plus display humidity straight, for example: temperature display 35℃ calibration temperature increase of 5℃ then the display temperature should be 40℃.  Reset: press the left up and down keys do not let go, the screen displays 888, you can restore the factory settings.  PT: Delay start For example: 1 minute delay When the temperature reaches the set value after the relay to be delayed for 1 minute to start.  AH: Over-temperature alarm: For example: over-temperature alarm temperature setting 50 degrees, when the temperature is greater than or equal to 50 degrees buzzer alarm.  AL: Low temperature alarm: For example: low temperature alarm temperature setting 20 degrees, when the temperature is less than or equal to 20 degrees buzzer alarm.