refractometer

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refractometer

 [re″frak-tom´ĕ-ter]
1. an instrument for measuring the refractive power of the eye.
2. an instrument for determining the indexes of refraction of various substances, particularly for determining the strength of lenses for spectacles.

re·frac·tom·e·ter

(rē'frak-tom'ĕ-ter),
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media. See: refractive index.
[refraction + G. metron, measure]

re·frac·tom·e·ter

(rē'frak-tom'ĕ-tĕr)
An instrument for measuring the degree of refraction in translucent substances, especially the ocular media.
See also: refractive index
[refraction + G. metron, measure]

refractometer 

1. An instrument for measuring the refractive index of transparent objects. There exist several types: Abbé's refrac-tometer, which is based on the measurement of the critical angle at the interface between a sample and a prism of known index of refraction and uses white light whereas that of Pulfrich, which is based on the same principle as Abbé's, uses monochromatic light. As the refractive index of some materials is related to their water content, the handheld Atago CL-1 Soft lens Refractometer has been calibrated to provide a reading of the percentage of water content of soft contact lenses.
2. See optometer.
References in periodicals archive ?
Most of the automatic refractometers available today feature sapphire prisms as opposed to glass.
The Leica ARIAS 500 is the world's first automatic transmitted light refractometer, designed to deliver accurate, repeatable results through automatic shadowline detection and interpretation.
The usefulness and limitations of handheld refractometers in veterinary laboratory medicine: an historical and technical review.
The THP concentration was determined using a Reithert VET 360 analog blood animal protein refractometer and was measured in grams per 100 mL.
Digital refractometers depend on the same optical property of solids and liquids dissolved in water, but they incorporate a light-emitting diode and optical sensor as well as analog-to-digital conversional electronics to provide a more accurate and precise reading.
Particularly for gemstone refractometers, there have been attempts to increase this range by using materials with a higher refractive index (such as zirconia, with n = 2.26), but the attempts have been problematic, as almost no contact liquids with comparably high indices are available.
The long-forgotten refractometer is finding a real niche in the new millennium.
In one institution, standard practice was to measure specific gravity using the refractometer. Reagent strips were used to measure urine pH and all other substances.
All refractometers prior to the Optilab rEX use two photodetectors, whereas the Optilab rEX uses 512 photodetectors in one photodiode array.
Maselli's UR15 automatic process refractometer helps fruit processor measure BRIX on-the-fly.
Tenders are invited for Supply of Vacuum Pump, Heating mantle of 250, 500 and 1000 mL capacity, Fractional distillation set, Weighing Balance (3 digit), Centrifuge (Remi Equivalent), Distilled water plant, Microwave oven, Thermostatic water bath for kinetics, Conductometers, Potentiometers, Colorimeters, Refractometers, Platinum wire (?
Mettler-Toledo's LiquiPhysics Excellence density and refractometers are simple to operate, sophisticated and secure, making them suited for stress-free compliance within the pharmaceutical industry's regulatory demands.