1) Mountain measurer 
• (n.) An aneroid barometer having a second scale that gives the approximate elevation above sea level of the place where the observation is made.
O·rom'e·ter noun [ Greek ... mountain + -meter .] (Meteor.) An aneroid barometer having a second scale that gives the approximate elevation above sea level of the place where the observation is made. 
orometer, orometric A barometer with a scale that indicates elevation above sea level; including mountains.
an aneroid barometer with a scale giving elevations above sea level, used to determine land-surface altitudes.