i'd agree with what rkomar said. have a look at what i posted to Gudrus' thread, he was looking for similar features too:
https://www.mobileread.com/forums/sho...d.php?t=116959 (not sure how to post a link to an individual post though).
having played with the 903 for a while, i will say that i have had no problems reading scientific/technical textbooks or journal articles (papers) on the 903's screen, in the default viewer, at the default zoom (fit width). most figures and illustrations display OK, although there will always be one or two really detailed papers where you can only make out the general idea of the figure, not all the individual details.