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Nivel hidraúlico, perfeccionado del tipo de los basados en la Ley de vasos comunicantes, y que comprenden dos cuerpos extremos graduados, comunicados entre si mediante un tubo flexible, caracterizado esencialmente por el hecho de que cada uno de los cuerpos está constituido por un poliedro de bases paralelas que permiten su adosamiento tanto a techos como a suelos para determinar su nivelación, en tanto que, al menos, dos de sus caras laterales son también paralelas para permitir su adosamiento a las paredes.