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Differential refractometer

detector that measures the refractive index of an analyte relative to the solvent

Pronunciation
/ˌdɪfəˈrɛnʃəl ˌriːfrakˈtɒmɪtə/
/ˌdɪfəˈrɛntʃəl rəˌfrækˈtɑmədər/