I often get asked if the Parrot Teleprompter can scratch a phone's screen. I have sold thousands of these and I have yet to have anyone run into this issue. The reason why the Parrot Teleprompter can't scratch your screen is due to the scientific property known as hardness. It's just as you would think, a harder object will scratch a softer object. There are a number of methods and scales to measure hardness including Mohs, vicker, and the rockwell scale.
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