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Creuzet Spectrometers Spectrometer 6" circle, 1 minute of an arc, vernier readable by two opposite verniers.Spectrometer 6" circle, 30 seconds of an arc, vernier readable by two opposite verniers.Spectrometer 7" circle, 1 minute of an arc, vernier readable by two opposite verniers. Spectrometer 7" circle, 30 seconds of an arc, vernier readable by two opposite verniers.Spectrometer 7" circle, 10 seconds of an arc, vernier readable by two opposite verniers.
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