.....you know I've never even tried an auto darkening helmet. I know when I put a #10 lens in my regular helmet that it gives me #10 protection. I also know that if I put a #9 lens in that I've got #9 lens protection. But w/ an auto darkening helmet how do you know exactly what you have??? I've never even looked at them closely, I know nothing about them. As Classickustoms stated in his previous post, you just adjust until you see the ripples in the weld, do you do this with all of the auto helmets or do some of them have actual settings with numbers on them??? Thanks, Bill