Level for the gradient using an aluminum profile from 600 mm. Section 50x23 mm. Thickness 2 mm. Equipped with an extra special bubble that allows control of the inclinations. The model has two central vial, one indicates the leveling traditional, the other with more features, measures the angle of the plane in mm / m with references for inclinations from 10-20-30-40 mm / m. Useful to give an inclination, etc.. Accuracy of vials central 0.5 mm / m.