1, // This custom var is set to slot #1. Required parameter.
'Device Pixel Ratio', // category
window.devicePixelRatio, // This value of the custom variable
2 // Sets the scope to session-level.
Different iPhones and different iPads all have the same user agent – and unfortunately a bit of an odd pixel size reporting – this is frustrating in that if you are testing, or simply curious, its nearly impossible to tell which models are more popular.
Although the iOS is different – 4,4s and 5 can all have the same OS, but the resolution has changed in each – this may or may not work however – I will update later.
Ooops – ran out of custom vars, not really using them so will disable them for a while!
Thanks to @danbarker for the suggestion!