Just like the stainless steel models of the Apple Watch, the Apple Watch Ultra features sapphire crystal to cover the display. Since sapphire is one of the most hardest minerals known, it is extremely difficult to scratch – which makes it perfect for premium watches. This time, JerryRigEverything put the sapphire crystal of the Apple Watch Ultra under test to compare it with other smartwatches that also have a sapphire cover.
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