1.The air gun/soldering iron features -50ºC to +50ºC temperature compensation
2.The air gun/soldering iron features ºF/ºC conversion
3.The air gun features manual/automatic work mode conversion4.The soldering iron features a sleep function that can be set from 0-99 minutes.YIHUA992DA+ upgrade version have all above YIHUA992DA basic function, also additional below function :A)Three section temperature storage mode (able to store hot air gun temperature, soldering iron temperature, air volume, temperature correction, automatic hibernation, automatic and manual mode, etc. These three sections can be switched freely).B)Cold air function added, able to switch between hot air and cold air.
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