We don't have synonyms for carbonometer yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are chronometer, harmonometer and carbometer.
(n) :
(obsolete, inorganic chemistry, physical chemistry) An early device for measuring the concentration of carbon dioxide in a gas, by bubbling it through limewater and measuring the cloudiness.
(n) :
(obsolete, inorganic chemistry, physical chemistry) An early device for measuring the concentration of carbon dioxide in a gas, by bubbling it through limewater and measuring the cloudiness.