Jisho

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Noun
1. spectroscope; spectrographSee also 分光計
Wikipedia definition
2. SpectrometerA spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's intensity but could also, for instance, be the polarization state.
Read “Spectrometer” on English Wikipedia
Read “分光器” on Japanese Wikipedia
Read “Spectrometer” on DBpedia

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