manometer

/məˈnɒmɪtə/

IPA: /M AE1 N OW0 M IY0 T ER0/

noun
  1. 1

    An instrument to measure pressure in a fluid, especially a double-legged liquid column gauge used to measure the difference in the pressures of two fluids.

Source: https://en.wiktionary.org/wiki/manometer