iOS Resolution
iPod touch 4th gen

iPod touch 4th gen

Family: iPod touch
Model: 4th gen

Logical Width: 320 pixels
Logical Height: 480 pixels

Physical Width: 640 pixels
Physical Height: 960 pixels

Pixels per Inch: 326
Retina Factor: 2

Release Date: 2010-09-01
More information: WikiPedia