LG Optimus 2X Engineering Mode

To activate you need to create a shortcut to this hidden menu.
Example using LauncherPro (others will use a similar method):

1.Long press on home screen
2.Select Shortcuts
3.Select Activities
4.Scroll down to and expand com.lge.hiddenmenu
5.Select HiddenMenu (first entry)
6.Enter Shortcut name
7.Click on shortcut to launch