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I recently got a 3M helmet with a battery operated auto-darkening. It is #3 when off and #11 when on, I think. It has a replacable screen saver. It was the first time I used a AD helmet and what a dream. I don't think it would be easy to forget to turn on, the lens is really quite dark when the helmet is not turned on and I would know something was not right. It cost about $200 CDN.
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