A refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry). The index of refraction is calculated from Snell's law and can be calculated from the composition of the material using the Gladstone–Dale relation

There are four main types of refractometers: traditional handheld refractometers, digital handheld refractometers, laboratory or Abbe refractometers, and inline process refractometers. There is also the Rayleigh Refractometer used (typically) for measuring the refractive indices of gases.

In veterinary medicine, a refractometer is used to measure the total plasma protein in a blood sample and urine specific gravity.

In drug diagnostics, a refractometer is used to measure the specific gravity in human urine.

In gemology, a refractometer is used to help identify gem materials by measuring their refractive index.Gemstones are transparent minerals and can therefore be examined using optical methods. As the refractive index is a material constant dependent on the chemical composition of a substance, it provides information on the type and quality of a gemstone. Classification with a special gemstone refractometer is an easy-to-use method with which the authenticity and quality of a stone can be evaluated. The gemstone refractometer is therefore a piece of basic equipment in a gemological laboratory. Due to the dependence of the refractive index (dispersion) on the wavelength of the light used, the measurement is normally taken at the wavelength of the sodium-D-line (NaD) of 589 nm.

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  Name SKU Description Category
PAL series digital Refractometer Easy to see and be used. Big digital reading. Water resistant.  Digital refractometers
ATA0028B- Ultra-light Digital Brix Refractometer ATA0028B- Ultra-light Digital Brix Refractometer.Temperature/Brix readings in 3 seconds for all products. Digital refractometers
MASTER series analog Refractometer *Economical. The Master-α, T, H series and ATC-20 are equipped with Automatic Temperature Compensation (ATC), which ensures accurate measurements despite differences in the ambient or sample's temperature. *The MASTER-50H, MASTER-80H, MASTER-93H, MASTER-100H are suitable for samples that are at a high-temperature or samples that contain acidic or corrosive ingredients. Analog refractometers
Desktop Refractometer T3-BX/RI Brix 0.0 to 18.0% Refractive Index 1.3300 to 1.3605 Analog refractometers
THE0001-MTA001V2 ABBE REFRACTOMETER BRIX/REFRACTIVE INDEX   It also measures the brix percentage of sugar solution. It was widely used in oil industry, fat industry, pharmaceutical factories, paint, food processing, chemistry, sugar refineries, geologic etc., and relative factories, school and research center. Specifications: Refarctive Index (nD) range: 1.300~1.700 Refarctive Index (nD) accuracy: 0.0002 Refarctive Index (nD) Min. Div. : 0.0005 Brix (%) range : 0~95 Brix (%) Min. Div. : 0.25 Total weight 3... Abbe refractometers