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I know that those devices I listed are too small for comfort use, but they are also cheap and portable, and I need them for outdoors usage, including on sunny days.
For example, I specifically named 7.8" Likebook Mars because I've read that it has "A2 refresh mode" that could allow for scrolling in landscape mode, something you don't want to do on conventional e-ink devices. Of course I totally agree it's too small for normal pdfs in portrait mode, in fact IMHO it's too small for both A4 and A5 in portrait(assuming standard text pdf with font size 10). But A5 in landscape with cropped margins could be possible if "A2 refresh mode" would allow for smoother scrolling(I've only heard about it so I have no clue if it's even possible). As I wrote, the measured screen dimensions of Likebook Mars is 158.5mm/119mm, where A5 paper dimensions are 210mm/148mm.
The only thing that comes to my mind is that Nxtpaper 40 and Nxtpaper 50 Pro would also have around 155mm width(in landscape mode) and because they are LCD, the text should be crispier than on E-Ink, and scrolling would be perfect.
Because you've said you had both Likebook Mars and Nxtpaper 40, which one would you get for A5 landscape scrolling mode? As I said, I know those are both bad choices but still better than what I got.
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