instrument that has a small tube in the shape of a U that is filled with liquid to measure pressure or flow, manometer, in which differential pressure is measured in U-tube as the difference h between the high-pressure reading and the low-pressure reading, multiplied by the density of the liquid in the tube, mõõtevahend, millel on U-kujuline väike toru, mis on rõhu mõõtmiseks täidetud vedelikuga, rõhumõõtur, mille abil diferentsiaalrõhku mõõdetakse U-torus kõrgrõhunäidu ja madalrõhunäidu erinevusena, korrutatuna vedeliku tihedusega torus