The Scrome rifle sight is designed to equip marksmen from the army, gendarmerie and police to adjust and check the harmonization of the scope on their rifle without shooting. This sight is of a single-piece construction, with its integrated mount on the body, allowing it to be mounted on its dedicated rod according to the calibers and ballistics of the ammunition used. The incrementation of its focal length makes it the most accurate instrument for guaranteed targeting. The rod with the collimator holder is factory set to average angles of drop and gyro drift. The integrated slope compensator makes it possible to regain verticality naturally