1.Industry face shield 2.Electro-optical technology of Germany 3 ... 4.The response time: 1/25000s. 1. Model of Industry face shield:EH-301, Configuration ADF Model: EF9848.2. ... cells, two lithium batteries be changed.10.Switching time of Industry face shield:a) Light to dark: 1/25,000s ... Tig/argon arc/arc welding/Gas welding.15. Colour of Industry face shield: blue,green,silver,black,yellow,red, And ...