How can I figure out the screen resolutions of devices that I can develop for using the Corona SDK?

Here is a partial lsiting of the devices the Corona SDK supports, and their native resolution:

Device	Width	Height	PPI
iPad	768	1024	?
iPod Touch	320	480	?
iPhone	320	480	?
Kindle Fire (Amazon)	600	1024	169
iPhone	320	480	?
iPhone	320	480	?