Sizes                     diagonal  resolution ppi (pixe/inch)
                          in inch
iPod touch 123x58  mm     (4   )    1136x640  (326 )
iPhone 5   123x58  mm     (4   )    1136x640  (326 )
iPad mini  200x134 mm     (7.9 )    1024x768  (163 )
iPad       241x185 mm     (9.7 )    2048x1536 (264 )
MacBook Air               (11.6)    1366x768
MacBook Air               (13.3)    1440x900
MacBook Pro               (13.3)    2560x1600 (227 )
MacBook Pro               (15.4)    2880x1800 (220 )
Nexus 4                   (4.7 )    1280x768  (320 )
Nexus 7                   (7   )    1280x800  (216 )
Nexus 10                  (10  )    2560x1600 (300 )
Samsung Galaxy Y GT-S5360 (3   )    320x240   (133 )
Samsung S 4               (5   )    1920x1080 (441 )
Galaxy Tab 2              (10.1)    1280x800