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  2. Refractometer - Wikipedia

    en.wikipedia.org/wiki/Refractometer

    In the machine industry, a refractometer is used to measure the amount of coolant concentrate that has been added to the water-based coolant for the machining process. In homebrewing , a brewing refractometer is used to measure the specific gravity before fermentation to determine the amount of fermentable sugars which will potentially be ...

  3. Refractometry - Wikipedia

    en.wikipedia.org/wiki/Refractometry

    A refractometer is the instrument used to measure refractive index ("RI"). Although refractometers are best known for measuring liquids, they are also used to measure gases and solids, such as glass and gemstones.

  4. Pensky–Martens closed-cup test - Wikipedia

    en.wikipedia.org/wiki/Pensky–Martens_closed-cup...

    This allows the development of an equilibrium between the liquid and the air volume. The ignition source is directed into the cup at regular intervals with simultaneous interruption of stirring. The test concludes upon observation of a flash that spreads throughout the inside of the cup. The corresponding temperature is the liquid's flash point.

  5. Autorefractor - Wikipedia

    en.wikipedia.org/wiki/Autorefractor

    Shin Nippon Nvision K-5001 Refkeratometer The optics inside a Shin Nippon Nvision K-5001 Refkeratometer. The majority of autorefractors calculate the vision correction a patient needs (refraction) by using sensors that detect the reflections from a cone of infrared light.

  6. Digital handheld refractometer - Wikipedia

    en.wikipedia.org/wiki/Digital_handheld_refractometer

    A digital handheld refractometer is an instrument for measuring the refractive index of materials. Principle of operation Most ...

  7. Abbe refractometer - Wikipedia

    en.wikipedia.org/wiki/Abbe_refractometer

    In the Abbe refractometer the liquid sample is sandwiched into a thin layer between an illuminating prism and a refracting prism. The refracting prism is made of a glass with a high refractive index (e.g., 1.75) and the refractometer is designed to be used with samples having a refractive index smaller than that of the refracting prism.

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