The device consists of a shifting square (2) comprising two branches (3-4) combined with a protractor comprising a notch (5) in which is inserted the shifting square after reading the angle.

The invention concerns a device for reading and indicating angular cuts of the shifting square type, combined with a protractor.

A multi-purpose tool may be conveniently used to take the place of several separate tools such as a speed square, a T-bevel, and an extended torpedo level.

Using a false square, you can measure the angle under the attic and thus cut the side walls of the boxes so as to fit them in perfectly.