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  2. Refractometer - Wikipedia

    en.wikipedia.org/wiki/Refractometer

    The refractometer is used to help identify gem materials by measuring their refractive index, one of the principal properties used in determining the type of a gemstone. Due to the dependence of the refractive index on the wavelength of the light used (i.e. dispersion), the measurement is normally taken at the wavelength of the sodium line D ...

  3. Abbe refractometer - Wikipedia

    en.wikipedia.org/wiki/Abbe_refractometer

    Ernst Abbe (1840–1905), working for Carl Zeiss AG in Jena, Germany in the late 19th century, was the first to develop a laboratory refractometer. These first instruments had built-in thermometers and required circulating water to control instrument and fluid temperatures. They also had adjustments for eliminating the effects of dispersion and ...

  4. Cutting fluid - Wikipedia

    en.wikipedia.org/wiki/Cutting_fluid

    Cutting fluid is a type of coolant and lubricant designed specifically for metalworking processes, such as machining and stamping. There are various kinds of cutting fluids, which include oils, oil-water emulsions, pastes, gels, aerosols (mists), and air or other gases. Cutting fluids are made from petroleum distillates, animal fats, plant oils ...

  5. Digital handheld refractometer - Wikipedia

    en.wikipedia.org/wiki/Digital_handheld_refractometer

    Digital handheld refractometers are generally more precise than traditional handheld refractometers, but less precise than most benchtop refractometers. They also may require a slightly larger amount of sample to read from since the sample is not spread thinly against the prism. The result may be displayed in one of various units of ...

  6. Inline process refractometer - Wikipedia

    en.wikipedia.org/wiki/Inline_process_refractometer

    Inline process refractometers are a type of refractometer designed for the continuous measurement of a fluid flowing through a pipe or inside a tank. First patented by Carl A. Vossberg Jr. US2807976A - Refractometer US2549402A, these refractometers typically consist of a sensor , placed inline with the fluid flow, coupled to a control box.

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