This square has a rafter table, a brace table, and an octagon scale engraved on it, as well as graduations on both faces – in 8ths and 16ths on one face and in 10ths and 12ths on the other. The angular accuracy is ±0.001 radian (1/17°) for the outside edge.
The markings, filled with permanent black chrome finish, are deeply photo-engraved so that they cannot be obliterated through wear. The hardened stainless-steel construction ensures that the square is rustproof, rigid, and non-marking in use. Size is 16" x 24".
Made in Japan.