Spirit Level (Bubble Level)

Spirit Level It’s a beautiful, functional and easy to use. Great pocket tool. It uses accelerometer to help you test most object for his level or plumb. Spirit Level is accurate and simple to use and incredibly useful tool for your Android device.
The Spirit Level is only as good as your accelerometer. For indication only. Use you device as a real spirit level.
Spirit level also known as Bubble level is a free and accurate tool.
A spirit level or bubble level is an instrument designed to indicate whether a surface is horizontal (level) or vertical (plumb).