hypsometer
Noun
Meaning
An instrument for measuring heights by observation of barometric pressure; esp., one for determining heights by ascertaining the boiling point of water. It consists of a vessel for water, with a lamp for heating it, and an inclosed thermometer for showing the temperature of ebullition.
Source: Webster's dictionarySynonyms
instrument
altimeter
altimetry
cathetometer
direction finder
boiling point thermometer
hypsometric altimeter
level measuring set