caffinated - 11:22 am on Aug 22, 2013 (gmt 0)
There is no device with a pixel ratio of 1.9. There's 1, 1.5 and 2. You can find a 1.3 and there are a few 3's out there.
Using Lucy24's principle, and as this is a max value, it should preclude anything less than 1.9, thus it should trigger on all lower values including 1, 1.5, 1.3 etc. Or...do I need to actually generate options for every possible pixel-ratio on the market? Maybe I do?