I use a lighter to test the auto darkening. Just strike the flint in front of it and it should darken.

If I were welding on a regular basis I would be very concerned about my eyes and lungs. As I weld only on an occasional basis I am more concerned about my lungs than my eyes. If you don't know what COPD is then read a little before you weld. Vaporized metal has no place in your body.

Wire feed welders are great for auto body work. I still haven't learned to TIG weld, it's coming.