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The book The Martian embedded three different fonts in the book. The fonts used were Free Serif, Free Sans, and Free Mono. Yes, these fonts are free ad can be used for embedding. But they are some of the worst fonts ever. On eInk they are very light and not easy to ready with. Free Mono was the worst one and it was just so so light. Even on LCD they aren't good.
So if you do not have an eInk Reader, you need to get one. You have to make sure the fonts work on eInk and the only way to do that is to see how they look. And they can look a little different on Kobo, Kindle, and nook. Forget the older models and go for a 300DPI model from each line. I suggest getting the 7" Kobo and Kindle and the nook GL3.
And if you are not embedding fonts but planning on selling via Kobo, I suggest getting a Kobo to test the ePub in both ePub and KePub to make sure it works the way you want. And since you are going with Kobo, don't have any overall left/right margins or any line hights. There are settings for that so the user can choose.
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