An E-book that is also a PDF reader ?
ableal: (re-run of a comment I made previously; device reads PDFs)iRex Digital Reader 1000S, 699 EUR; https://www.irexshop.com/    10.2 Inch (diagonal) electronic paper display
    1024 x 1280 pixel resolution at 160 pixels per inch
    16-level grey scale
    Mini-USB connector
    Wacom® penabled® touch sensor input with Stylus
    ...

More data and opinions over at http://mobileread.com, etc.