title_body: Exact readable screen size of Sony PRS-650
upvoted_answer: I don't know if this is exact enough, but based on a combination of my own manual measurements and specifications listed in the user guide (warning links to pdf directly):
  
  
  Screen resolution is 600(w) x 800(h) pixels 
  Screen measurements (approx, done myself) are 92(w) x 122(h) mm
  Using this calculator, that gives us a dpi of approx 44.
  Approx measurement of status bar is 5mm (using same calculator as above we get ~33 pixels)
  
  
  Conclusion:
  
  
  Readable screen height is 600(w) x 767(h) pixels or 92(w) x 118(h) mm