Roofus

Roofus is a building tool that combines the features of a combination square, bevel, protractor, level and speed square in one easy to use tool. The blade can be extended or retracted to the required depth and rotated to the required angle before being held in position using the pivot lock. The square lock can even be used to set the blade at 90 degrees before locking the depth with the pivot lock. The front has common degree markings whilst the back is calibrated for hip and valley work, so there's no job you can't take on.