Good Gear Guide
In Pictures: iOS 7 tips and tricks you need to lea...
Built-in inclinometer and level
Hidden within in the compass app is a great new utility that acts as a level. You can use it to make sure picture frames are straight and even to measure the angles of various slopes.
To access it, open up the compass app and swipe to the left. The inclinometer will appear and you can get to work! When a measurement is completely level, the screen will light up in green.
In Pictures: iOS 7 tips and tricks you need to learn