Code for "Determining if a device is a tablet on Titanium Appcelerator" blog post: http://www.libtronics.com/2013/10/determining-if-device-is-tablet-on.html

Titanium_original.js

//considering tablet to have one dimension over 900px - this is imperfect, so you should feel free to decide	
//yourself what you consider a tablet form factor for android
var isTablet = osname === 'ipad' || (osname === 'android' && (width > 899 || height > 899));