gastrotonometer

gas·tro·to·nom·e·ter

(gas'trō-tō-nom'ĕ-tĕr),
An apparatus used in gastrotonometry.

gastrotonometer

(găs″trō-tō-nŏm′ĕ-tĕr) [″ + tonos, tension, + metron, measure]
An instrument formerly used for measuring intragastric pressure.