Screen density

I have done a bit study regarding how well the screen density for my planned gadget with current existing gadget that I have and to my surprise, the result is not quite I expected.

iPad 2 9.7" RM1499
768 x 1024 pixels, 4:3 ratio (~132ppi density)

*Galaxy Tab A 8.0" RM599
800 x 1280 pixels, 16:10 ratio (~189 ppi density)

Memopad HD 7" RM499
800 x 1280 pixels, 16:10 ratio (~216 ppi density)

Surface Pro 3 12″ RM3600
2160×1440 pixels 2:3 ratio (~216 ppi density)

*Galaxy Tab A 10.1" RM899
1200 x 1920 pixels, 16:10 ratio (~224 ppi density)

*iPad 2018 9.7" RM1459
1536 x 2048 pixels, 4:3 ratio (~264 ppi density)

*iPad Air 2019 10.5" RM2159
1668 x 2224 pixels, 4:3 ratio (~265 ppi density)

*iPad Mini 2019 8" RM1759
1536 x 2048 pixels, 4:3 ratio (~324 ppi density)

Moto G Dual Sim 1st Gen 4.5" RM650
720 x 1280 pixels, 16:9 ratio (~326 ppi density)

Galaxy J7 Prime 5.5" RM1199
1080 x 1920 pixels, 16:9 ratio (~401 ppi density)







*planned gadget