So far so good. Bought for my new Coros Pace 2 and I think it fits perfectly. Between the protective film and the edge of the bezel is 1mm of exposed dial, but for me that's pretty damn good. Easy to install and clean. No air bubbles to deal with. I don't know what purity means. glare? If so, then I can't say. The appearance of the dial is the same as without the protection.
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