Plumb Line is a practical and useful application brought to you by Train 4 Trade Skills, 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.
If you are a plumber, electrician, gas engineer or a keen DIY enthusiast you will find it particularly handy to have on your iPhone.
(A plumb line is also known in some parts of the world as a "plumb weight" or "plumb bob").