As far as we know, hot air rework station or hot air guns are very useful tools and are essential for any electronic workbench. There are many errors when using or building a printed circuit board. For your construction or manual construction, solder can usually have its own ideas. Sometimes people who do buildings (or people who build machines) can make mistakes. At other times, the solder or components on the PCB react in an undesired manner during reflow. However, please do not worry about that. There are ways to solve this problem! HAIRUI hot air rework station - 850D+ is such a solution.