I tried using a stylus pen "Adonit Pixel" that can write a slurl on the iPad or iPhone screen with 2048 strokes pressure sensation - GIGAZINE
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Adonit Pixel Stylus review - The Gadgeteer
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Artist Review: Adonit Pixel Pressure Sensitive iPad Stylus | Parka Blogs
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Adonit Pixel PRO iPad Pro Precision Stylus - Black