ScreenScale is based on the nominal dpi (dots per inch) of the display compared to that of a QVGA screen. QVGA devices have a dpi of 96. VGA and WVGA usually have a dpi of 192. So you will always see a ScreenScale of either 1 on QVGA devices and 2 on VGA or WVGA devices. Some Smartphones with other sizes of screen may have different dpis and so different ScreenScale values.
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