Refractometers are precision optical instruments designed to measure the concentration or mixture ratio of water soluble. Easy to use, just place a few drops of juice on the prism glass and hold up to the light. And ATC refractometers automatically compensate temperature changes so the user can just drop a few drops of a juice and read.
The Hand Held Refractometers provide with a direct reading of the Scales,and have been professionally designed for testing of concentration of many kinds of solution listed as following:Juices,Beverages,Honey,Salt water,Brine,Cleaning fluid,battery fluid,Antifreeze and Industrial fluids etc..It also is easier to use and offers a competitive price.
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 Theory of Refraction
If you place a pencil in a cup of water, the tip will appear bent. If you then put concentrated sugar water in a cup and try the same experiment, the tip of the pencil should appear even more bent. This is an example of the phenomenon of light refraction.
Refractometers are measuring instruments in which this phenomenon of light refraction is put to a practical use. Refractometers are based on the principle that as the density of a substance increases (e.g. when sugar is dissolved in water) , its refractive index rises proportionately.
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 1 . Refractometers utilise a prism which possesses a much a greater refractive index than the sample solution to be measured. Measurements are made possible using the refractive phenomena which arise at the interface of the prism and the sample solution.
2. In the case of a weak sample solution, the difference between the refractive index of the solution and that of the prism is great, therefore the angle of refraction is large (see A on the diagram below).
3. In the case of a strong sample solution, the difference between the refractive index of the prism is smaller and therefore the angle of refraction is smaller (see B on the diagram below).
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