I've tried just about every gadget and no-glare screen on my phone and out in the sunlight, it's just about useless. I need to set menus so I know where things are without having to "see" the screen, and I set specific ringtones for people I know always since I can't even tell who's calling from the screen while outside.
I don't think you're going to have any luck reading in the sun on a tablet no matter what you try. If you get to the point of managing it, I don't think the reading will be that enjoyable since it will be still very difficult to read.
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