hygroscope
溼度計
hy·gro·scope /ˈhaɪgrəˌskop/ 名詞
溼度計,驗濕器
Hy·gro·scope n. Physics An instrument which shows whether there is more or less moisture in the atmosphere, without indicating its amount.
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hygroscope
n : hygrometer that shows variations in the relative humidity of
the atmosphere