如何检测Android平板电脑。Useragent吗?

I have looked everywhere. We are using a Motorola Zoom to try our tablet site testing. The issue is that the Android Useragent is a general Useragent and there is no difference between tablet Android and mobile Android. I don't want to just target a specific device like the Xoom Useragent since Android will most likely be on multiple tablet devices in the near future.I have looked everywhere. We are using a Motoro