Plumb Line is a practical and useful application brought to you by Train 4 Trade Skills, it turns your iPhone into a tool that will enable you to measure the vertical angle of almost any object accurately. Plumb Line provides visual and numeric feedback making it easy to use.
Great little app by The Idiotechnician
This is a handy app that helped me out when I was without my level! Nicely put together and simple to use. 5/5