title_body: What 's the best way to read a scientific PDF? I need to buy a device for reading. It must have all these features:
  
  
  Smoothly zoom all pictures
  Format all tables properly
  Read PDF (or be able to convert)
  Not create eye problems and be visible in the sun
  
  
  Is there a category of devices that is able to meet all these demands? What is the best size?
upvoted_answer: Buy an iPad or iPad mini and install Goodreader (the latest version at this time is actually called GoodReader 4, according to the previous link; it can be found here).That is the best choice.