>I am looking at this tool, Electric Mobile Studio 2012. of which I have learned from John Pappa's course on Pluralsight.
>The tool is not free but not very expensive. Anybody is using this tool? Like it?

Haven't used it so can't comment - but I see a trial version is available : http://visualstudiogallery.msdn.microsoft.com/6bed5adb-1d6a-483d-9e22-ae0f88ec4477

>Another tool designed for the same purpose you like?

If you just need to get an idea of the HTML layout then there are a couple of online sites:
http://ipad-emulator.org/
http://ipadpeek.com/

The first does IPhone, IPad, Android , Blackberry and Tablet emulations. But, in the end, there's no substitute for testing and debugging on a real device - especially if a lot of JavaScript is involved.....

If you have an Android device then there's the Android SDK (http://developer.android.com/sdk/index.html) which includes the ADB (Android debugging bridge) to allow debugging a connected device using the standard Chrome Development tools.