seade atmosfäärirõhu jälgimiseks, milles erinevused välisrõhu ja seadmes asuvas karbikeses oleva rõhu vahel registreeritakse elastse diafragma ja osuti vahendusel, an instrument for monitoring the atmospheric pressure in which no liquid is employed, but rather changes in pressure between the atmosphere and a closed vessel bend a diaphram which moves a pointer on a scale