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Well ... it looks like a Sony ereader fits the bill. But keep in mind PDF is not an ebook format so it may not render well or you may have to zoom in or out depending of the book itself.
In terms of resisting high temperatures, unless you are not leaving it inside a car the whole day, most eink readers do well outside. I bring my Kindle to the beach here in Texas where is hot as hell, lol, with no issues at all.
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