There are four main types of refractometers : traditional handheld refractometers, digital handheld refractometers, laboratory or Abbe refractometers, and inline process refractometers.
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The sample changer is controlled by the refractometer and assures fully automated measurements of the samples placed in the vials of the sample changer for measurements.
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Then the density of the liquid is evaluated either directly by weighing or indirectly through its refractive index, which is measured with the Abbe refractometer.
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I squeezed a drop of juice on my refractometer, a device for measuring sweetness, and it registered 30.5, almost off the scale.
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Many refractometers have built in " Automatic Temperature Compensation " ( ATC ) which is based on knowledge of the way the refractive index of sucrose changes.
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Over a century after Abbe's work, the usefulness and precision of refractometers has improved, although their principle of operation has changed very little.
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This is commonly achieved using a measurement of refractive index ( refractometer ) or the angle of rotation of polarization of optically active sugars ( polarimeter ).
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As a consequence, a refractometer measurement made on a sugar solution once fermentation has begun will result in a reading substantially higher than the actual solids content.
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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.
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In homebrewing, a refractometer is used to measure the specific gravity before fermentation to determine the amount of fermentable sugars which will potentially be converted to alcohol.
