![]() We then recorded the number of the hardest stylus that didn’t scratch the glass, along with the number of the stylus that did. Unless two protectors were very close in hardness, the variance in pressure was unlikely to hide the difference, as we saw little ambiguity in the tests: When something scratched, it was very evident.) For each screen protector, we repeated this test with increasing reference picks until a pick scratched the glass. (We couldn’t guarantee precisely consistent pressure across trials, but we did our best to use a similar amount of force each time. In the Mohs test, we started with the number-1 stylus, holding it at about a 70-degree angle and applying a moderate amount of force as we dragged it down the glass protector multiple times in varied directions.
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