re·frac·tom·e·ter /ˌriˌfrækˈtɑmətɚ/
  折射計
  re·frac·tom·e·ter /ˌrɪˌfrækˈtɑmətɚ, rɪ-/ 名詞
  折光計,折射計,屈光計
  Re·frac·tom·e·ter n.  Opt. A contrivance for exhibiting and measuring the refraction of light.
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  refractometer
       n : measuring instrument for measuring the refractive index of a
           substance