1.Gas welding 2.Viewing area: 91*41mm 3.Variable shade ... 25,000s 5.German technology Products meet the indicatorsGAs welding safety face mask (EH-228/EF9040) 1. Model:EH-228/EF9040 ... , two lithium batteries be changed.10. Switching time of Gas welding):a) Light to dark: 1/25,000s.b) ... EF9242,EF9848.14. Application:Mig/Tig/argon arc/arc welding/Gas welding.15. Colour: blue,green,silver,black,yellow,red, ...