Bit late to this one but by using WEBGL_debug_renderer_info extension, which is part of the WebGL API, you are able to retrieve the vendor of the GPU and the renderer name.
Combining this with screen dimensions of the device you can accurately define which version it is.
// iPad model checks.
function getiPadModel(){
// Create a canvas element which can be used to retreive information about the GPU.
var canvas = document.createElement("canvas");
if (canvas) {
var context = canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
if (context) {
var info = context.getExtension("WEBGL_debug_renderer_info");
if (info) {
var renderer = context.getParameter(info.UNMASKED_RENDERER_WEBGL);
}
}
}
if(window.screen.height / window.screen.width == 1024 / 768) {
// iPad, iPad 2, iPad Mini
if (window.devicePixelRatio == 1) {
switch(renderer) {
default:
return "iPad, iPad 2, iPad Mini";
case "PowerVR SGX 535":
return "iPad"
case "PowerVR SGX 543":
return "iPad 2 or Mini";
}
// iPad 3, 4, 5, Mini 2, Mini 3, Mini 4, Air, Air 2
} else {
switch(renderer) {
default:
return "iPad 3, 4, 5, Mini 2, Mini 3, Mini 4, Air, Air 2";
case "PowerVR SGX 543":
return "iPad 3";
case "PowerVR SGX 554":
return "iPad 4";
case "Apple A7 GPU":
return "iPad Air, Mini 2, Mini 3";
case "Apple A8X GPU":
return "iPad Air 2";
case "Apple A8 GPU":
return "iPad Mini 4";
case "Apple A9 GPU":
return "iPad 5, Pro 9.7";
}
}
// iPad Pro 10.5
} else if (window.screen.height / window.screen.width == 1112 / 834) {
return "iPad Pro 10.5";
// iPad Pro 12.9, Pro 12.9 (2nd Gen)
} else if (window.screen.height / window.screen.width == 1366/ 1024) {
switch(renderer) {
default:
return "iPad Pro 12.9, Pro 12.9 (2nd Gen)";
case "Apple A10X GPU":
return "iPad Pro 12.9 (2nd Gen)";
case "Apple A9 GPU":
return "iPad Pro 12.9";
}
} else {
return "Not an iPad";
}
}
It can also be done for iPhone models, this blog goes into more detail.
Mobile/8F190
token is incremented by 1 for ipad2? some thing to google for.. – Mythologize