The machine has a self-test function, full intelligent over-temperature, short-circuit, open circuit, overload and fault display and protection functions;853AA temperature correction function: to adapt to the environmental impact, or replace the heating elements, soldering iron tips etc. spare parts caused by temperature deviation, can use this function calibration temperature. The correction temperature range is -50 °C ~ +50 °C;853AA has Celsius / Fahrenheit temperature display function: meet different market needs to design the temperature display mode, you can choose under customary interest.