We then recorded the number of the hardest stylus that didn’t scratch the glass, along with the number of the stylus that did scratch it. ![]() ![]() Unless two protectors were very close in their 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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