This app was removed from the App Store.
iOS iPhone Utilities
The instrument has been used since the time of the ancient Egyptians by bricklayers, masons, and carpenters to make sure that their constructions are perfectly upright.
A plumb-bob or a plummet is a weight, normally has a pointed tip, its supposed to be suspended from a string and used as a vertical reference line, or plumb-line. Finally you have a digital version of a Plumb, if you normally need one.. then this is the perfect tool for you,