Until this year there’s been a pretty clear delineation between Amazon’s entry-level Kindle and the step-up Kindle Paperwhite. The pricier model offered a screen that was bigger, with higher resolution and a better internal light. That crisper E Ink display — 300 pixels per inch, or nearly twice the density of the 167 ppi on the older Kindle — made the Paperwhite an easy recommendation to those who could afford it.
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