alcoholometer
  酒精表,酒精比重計
  al·co·hol·om·e·ter /ˌælkəˌhɔˈlɑmətɚ/ 名詞
  醇比重計,酒精比重計
  Al·co·hol·om·e·ter Al·co·hol·me·ter n.  Chem. An instrument for determining the strength of spirits, with a scale graduated so as to indicate the percentage of pure alcohol, either by weight or volume. It is usually a form of hydrometer with a special scale.
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