Refractometers

Refractometers measure the concentration levels of aqueous solutions by analysing the angle of light refraction in a few drops of liquid and plotting it on a refractive index. By calculating this index – the speed at which light passes through a substance - you can analyse a sample’s purity and establish the concentration of dissolved materials.

How do refractometers work?

Standard refractometers measure the degree to which light changes direction in transparent substances, which is called the angle of refraction. As light passes through a liquid it creates a bending illusion, and the degree to which it bends depends on the amount of dissolved substance present. A refractometer takes the refraction angles and correlates them to refractive index (nD) values. Typically reported to a ten-thousandths place, you can use these values to determine the concentrations of solutions.

Some refractometers use the Brix scale. A Brix refractometer relates the concentration of sucrose in water to the solution’s refractive index.

What are the different types of refractometer?

Hand refractometers allow quick and easy measurement in liquid and semi-solid samples. They work on the critical angle principle in which lenses and prisms project a shadow line onto a small glass reticule inside the instrument, which is viewed through a magnifying eyepiece.

The digital handheld refractometer operates on the same principle but with light from an LED focused on the underside or a prism element. When a sample is applied to the measuring surface of the prism some of the light is transmitted through the solution and lost, while the remaining light is reflected onto an array of photodiodes creating a shadow line. Once the position of the shadow line has been automatically determined, the internal software correlates the position to the refractive index to display a reading.

Where are refractometers used?

Refractometers are relied upon for quality control in the food and drink industries. They’re also used by jewellers to analyse the purity of gemstones and can even be used for home-brewing, monitoring the salinity or specific gravity of water in fish tanks, and making preserves.


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Description Price Refractometer Type Maximum Measurement Minimum Measurement Best Accuracy Resolution Measurement Time Type Battery Type Battery Life Power Source Dimensions Weight Height Length
RS Stock No. 877-1781
BrandRS PRO
HK$1,410.32
Each
units
Mix Cutting Fluids 18% 0% ±0.1 % 0.1 %Brix - - - - - 96 x 60 x 230mm 525g 60mm 230mm
RS Stock No. 667-2159
Mfr. Part No.HI 96801
HK$3,031.60
Each
units
Sucrose +80 °C, 85 %Brix 0 %Brix, 0 °C ±0.2 %Brix 0.1 %Brix, 0.1 °C 1.5s Digital/Optical 9V 5000 Tests Battery 192 x 104 x 69mm 420g 69mm 192mm
RS Stock No. 899-8034
Mfr. Part No.ORA 4RR
BrandKern
HK$834.34
Each
units
Expert applications - - - - - Analogue - - - - - - -
RS Stock No. 899-8037
Mfr. Part No.ORA 4UA
BrandKern
HK$834.34
Each
units
Industry / Automotive 35% 30% - - - Analogue - - - - - - -
RS Stock No. 136-3530
Mfr. Part No.ORA 6HA
BrandKern
HK$981.58
Each
units
- 30% 12% - 0.1 % - Digital/Optical Rechargeable Battery - Battery 130 (Dia.) x 200mm 140g - 200mm
RS Stock No. 344-5507
Mfr. Part No.300003
HK$3,387.38
Each
units
Sugar 80% 0% ±1 % 1 % - Optical - - - 1-1/2 (Dia.) x 7mm 538.6g - 7in
RS Stock No. 344-5535
Mfr. Part No.300006
HK$3,162.36
Each
units
Salt 28% 0% ±0.2 % 0.2 % - Optical - - - 1-1/2 (Dia.) x 6-3/4mm 184.3g - 6-3/4in
RS Stock No. 181-1151
Mfr. Part No.ORF 2WM
BrandKern
HK$3,486.45
Each
units
- 22 (Vol. AP) %, 25 (KMW) °KMW, 35 (Mass SW) %, 150 (Oechsle) °Oe 0 (KMW) °KMW, 0 (Mass SW) %, 0 (Oechsle) °Oe, 0 (Vol. AP) % ± 0.2 (KMW) °KMW, ±0.2 (Mass SW) %, ±0.2 (Vol. AP) %, ±1 (Oechsle) °Oe - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS Stock No. 685-768
Mfr. Part No.52060
BrandRocol
HK$1,601.49
Each
units
Grinding Fluids, Mix Cutting Fluids - - - - - - - - - - - - -
RS Stock No. 899-8021
Mfr. Part No.ORA 3SA
BrandKern
HK$834.34
Each
units
Salt 28% 0% - - - Analogue - - - - - - -
RS Stock No. 136-3534
Mfr. Part No.ORT 1RS
BrandKern
HK$6,772.90
Each
units
- 1.7 nD, 95 % 0 %, 1.3 nD ±0.0002 nD, ±0.1 % ±0.0005 nD, ±0.25 % - Digital/Optical - - - 180 x 90 x 240mm 2kg 240mm 180mm
RS Stock No. 899-8028
Mfr. Part No.ORA 32BA
BrandKern
HK$834.34
Each
units
Sugar 32% 0% - - - Analogue - - - - - - -
RS Stock No. 181-1155
Mfr. Part No.ORF 85BM
BrandKern
HK$3,877.24
Each
units
Sugar 1.5100 (Refractive Index) nD, 85 (Brix) % 0 (Brix) %, 1.3330 (Refractive Index) nD ±0.0003 (Refractive Index) nD, ±0.2 (Brix) % - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS Stock No. 899-8015
Mfr. Part No.ORA 1UA
BrandKern
HK$834.34
Each
units
Industry / Automotive 40% 0% - - - Analogue - - - - - - -
RS Stock No. 899-8012
Mfr. Part No.ORA 1SA
BrandKern
HK$834.34
Each
units
Salt 100% 0% - - - Analogue - - - - - - -
RS Stock No. 181-1147
Mfr. Part No.ORF 1PM
BrandKern
HK$3,337.37
Each
units
- 1.050 (Urine) sgU, 1.3900 (Refractive Index) nD, 12 (Serum Protein) g/dL 0 (Serum Protein) g/dL, 1.000 (Urine) sgU, 1.3330 (Refractive Index) nD ±0.0003 (Refractive Index) nD, ±0.001 (Urine) sgU, ±0.1 (Serum Protein) g/dL - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS Stock No. 899-8019
Mfr. Part No.ORA 20BA
BrandKern
HK$834.34
Each
units
Sugar 20% 0% - - - Analogue - - - - - - -
RS Stock No. 181-1152
Mfr. Part No.ORF 3SM
BrandKern
HK$3,337.37
Each
units
Salt 1.4100 (Refractive Index) nD, 28 (Salt (NaCl)) %, 45 (Brix) % 0 (Salt (NaCl)) %, 0 (Brix) %, 1.3330 (Refractive Index) nD ±0.0003 (Refractive Index) nD, ±0.2 (Brix) %, ±0.2 (Salt (NaCl)) % - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS Stock No. 899-8031
Mfr. Part No.ORA 80BB
BrandKern
HK$785.26
Each
units
Sugar 80% 0% - - - Analogue - - - - - - -
RS Stock No. 344-5484
Mfr. Part No.300001
HK$3,032.06
Each
units
Sugar 32% 0% ±0.2 % 0.2 % - Optical - - - 1-1/2 (Dia.) x 6-3/4mm 170.1g - 6-3/4in
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