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1·When arclight disappears the goggles will turn to be light automatically.

当弧光消失时，护目镜会自动变亮。

2·Its characteristic is that the goggles immediately turn dark from light state after arc-starting- When arclight disappears the goggles will turn to be light automatically.

其特点是护目镜随弧光的开启自动变暗，而随弧光的停止又自动变亮；