This is my third breed of these holders. It is the most flexible in terms of size as it fits both an iPad tablet and a phone. I mount it on a mic stand so I can read chord charts while playing in a church band. It's the best I've found so far, while others I've used in the past are limited to just one tablet size.
Flexible Arm Tablet Holder, Lamicall Gooseneck Tablet Stand: Clip Mount for iPad Mini Pro Air, Switch, Galaxy Tabs, and More 4.7-10.5" Devices - Gray
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9 Review