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Pixel Aspect Ratio Google Analytics Custom Variable

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ga-ratio.js
JavaScript
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// Create the test
var pixelRatio = (window.devicePixelRatio >= 1.5) ? "high" : "normal";
..
 
// Pass it along through GA
var _gaq = _gaq || [];
_gaq.push(['_setAccount', 'UA-xxxxxxxx-x']);
 
// --- IMPORTANT LINE!
// params: event method, custom variable slot, variable name, variable value, scope level
// more info: https://developers.google.com/analytics/devguides/collection/gajs/gaTrackingCustomVariables
_gaq.push(['_setCustomVar', 1, 'Pixel Ratio', pixelRatio, 2 ]);
 
// Then start the trackin'
_gaq.push(['_trackPageview']);
 
(function() {
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
})();

Any Ideas how to implement this using Tag Manager ?

Retina display is available on Iphone 4 and 5. Ipad 3,4, air. Ipad Mini and Mac book pro 3rd generation. Not sure about the latest but this is possible to check devices on GA. Then know a bunch of data about how mush users requesting retina graphics.

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