From James McElveen:
2.0 Released! Use camera to check angle of objects in the distance. This is great for: Utility workers Fence post Mail Box Deck Anything that needs to be plumb you can test it with Plumb-Bob "from a distance" List of all new features Added camera support for objects in the distance iPhone 4 Retina Display support Highlights green when centered Degree display Updated graphics Improved physics Added Guidelines iAd Support What is a plumb-bob? A Plumb-Bob or a plummet is a weight with a pointed tip on the bottom that is suspended from a string and used as a vertical reference line. This instrument has been used since the time of the ancient Egyptians by bricklayers, masons, and carpenters to ensure that their constructions are "plumb", or perfectly upright. We realize chances are you will never carry around something around as low tech as string and a weight so Plumb-Bob is here to help you make sure your walls are straight in your house.