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.
Same question here: HOW TO IMPLEMENT USING GOOGLE TAG MANAGER?
@Studio738 @mshafei You will need to use the dataLayer, where you can push custom data. See more on how to do this: https://developers.google.com/tag-manager/devguide
the var you would pass would look like this: 'pixelRatio': 'high';