Temperature calibration function, calibration range:50 degree C environmental influence/ component aging/ sapre parts, these reasons are likely to cause machine temperature deviations. If temperature of preheat station,hot air gun,soldering iron error occurs,please correct them via correction function. Yihua hot air cover is high temperature flame retardant environmental protection materials; after lit air gun handle cover slowly , the flame is very small; then extinguish the lighter, flame is extinguished. False goods: hot air handle cover of false goods is made from recycling old materials,no flame retardant properties,it will continue to burn if fired.the handle cover is light quickly will caused larger flames and toxic pungent gas; then extinguish the lighter, the handle cover flames continue to burn and fire to expand. High temperature silicon cord the flame temp. Of the lighter is the highest, if you move 15 seconds close to the handle line, but the handle line just no any damage. Professional packaging transportation security strong buffer pearl cotton thickening box.