Level and Plumb master is a combined bubble level and 3D plumb line, with auto-function selection and sound signal.

Bubble Level

An easy-to-use spirit level. Simply hold the iPhone up to the surface you want to measure, and the large, clear display shows how level the surface is. You can use the iPhone either face-up or on it's side.

Plumb Line

Based on the traditional tool used for centuries, the plumb line is used to test if something is vertical. Hold the back or edge of the iPhone against the surface, and watch the plumb-line swing to position objects perfectly vertical.

Sound

Just like a reverse-park sensor, the app makes a sound that becomes quicker as it gets closer to level. The audio signal allows you to accurately level objects even when you can't see the front of the phone. Choose from 6 different sounds, and different sensitivity settings.