type of glass-tube manometer, which one leg has a relatively small diameter, and the second leg is a reservoir, in which the level of the liquid in the reservoir does not change appreciably with change of pressure, kaheharuline klaastoru rõhumõõtur, mille ühel harul on suhteliselt väike läbimõõt ja teiseks haruks on reservuaar, milles vedeliku tase rõhu muutumisega praktiliselt ei muutu