Powerful Easy Operation SMT Lead Free Hot Air Rework Soldering Gun Solder Station LED Digital Display This brand new SMD Rework Soldering Station 8508D is upgraded from 850 series and inherited all advantages. Microcomputer PID program control processor technology, precise digital display to show the gun temperature. Program always keeps track of the actual temperature of air to ensure the temperature compensating rate, good for enhancing temperature stability. Features automatic function, the air gun enters working mode when the gun is picked up and standby mode while it's put down. Manual function also available for all kinds of real-time operating convenience.