Piping measurement taking square, has magnetized part of surface situated at level of edges of square, where magnetized part cooperates with reference measurement surface by magnetization

摘要

The square (7) has a magnetized part (1) of a surface situated at a level of edges (2a, 2b, 3a, 3b) of the square. The magnetized part cooperates with a reference measurement surface by magnetization. The part is provided with respect to a body of the square in a slot type housing (8) that projects with respect to the edge (2a) of the square. Angle reporting graduations (5) are centered on an inner right angle point (4) of the square.