Handheld welding: SUP20S/T focus mirror replacementEnglish version注意:Note:1.更换时请注意现场环境,建议拆掉在办公室等相对环境较好的地方更换1. Pay attention to the on-site environment when replacing, it is recommended to remove it and replace it in a relatively good place such as the office2.聚焦凸面朝下(即安装后朝向保护镜方向)2. Focus convex side