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庫存編號 877-1781
BrandRS PRO
HK$1,133.70
單位
Mix Cutting Fluids 18% 0% ±0.1 % 0.1 %Brix - - - - - 96 x 60 x 230mm 525g 60mm 230mm
RS庫存編號 667-2159
製造零件編號HI 96801
HK$2,852.66
單位
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庫存編號 181-1152
製造零件編號ORF 3SM
BrandKern
HK$3,156.77
單位
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庫存編號 181-1147
製造零件編號ORF 1PM
BrandKern
HK$3,156.77
單位
- 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庫存編號 181-1155
製造零件編號ORF 85BM
BrandKern
HK$3,667.42
單位
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庫存編號 899-8025
製造零件編號ORA 4FA
BrandKern
HK$986.74
單位
Industry / Automotive - - - - - Analogue - - - - - - -
RS庫存編號 181-1153
製造零件編號ORF 45BM
BrandKern
HK$3,156.77
單位
Sugar 1.4098 (Refractive Index) nD, 45 (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庫存編號 899-8037
製造零件編號ORA 4UA
BrandKern
HK$1,202.53
單位
Industry / Automotive 35% 30% - - - Analogue - - - - - - -
RS庫存編號 181-1149
製造零件編號ORF 1RS
BrandKern
HK$3,992.38
單位
Salt - - ±0.0005 (Refractive Index) nD - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS庫存編號 344-5507
製造零件編號300003
HK$3,122.90
單位
Sugar 80% 0% ±1 % 1 % - Optical - - - 1-1/2 (Dia.) x 7mm 538.6g - 7in
RS庫存編號 899-8028
製造零件編號ORA 32BA
BrandKern
HK$1,202.53
單位
Sugar 32% 0% - - - Analogue - - - - - - -
RS庫存編號 181-1154
製造零件編號ORF 5UM
BrandKern
HK$3,156.77
單位
- 0 (CW) °C, 0 (EG) °C, 0 (PG) °C, 40 (Urea) % -50 (EG) °C, -50 (PG) °C, -40 (CW) °C, 0 (Urea) % ±0.2 (Urea) %, ±0.5 (CW) °C, ±0.5 (EG) °C, ±0.5 (PG) °C - - Digital AAA - Battery 133 x 65 x 38mm 200g 38mm 133mm
RS庫存編號 899-8019
製造零件編號ORA 20BA
BrandKern
HK$1,202.53
單位
Sugar 20% 0% - - - Analogue - - - - - - -
全新
RS庫存編號 188-3910
製造零件編號780B
BrandFacom
HK$1,363.35
單位
- - - - - - - - - - 700 x 235 x 70mm 472g 70mm 700mm
RS庫存編號 136-3530
製造零件編號ORA 6HA
BrandKern
HK$1,044.54
單位
- 30% 12% - 0.1 % - Digital/Optical Rechargeable Battery - Battery 130 (Dia.) x 200mm 140g - 200mm
RS庫存編號 181-1151
製造零件編號ORF 2WM
BrandKern
HK$3,156.77
單位
- 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庫存編號 899-8021
製造零件編號ORA 3SA
BrandKern
HK$1,202.53
單位
Salt 28% 0% - - - Analogue - - - - - - -
RS庫存編號 344-5484
製造零件編號300001
HK$2,777.25
單位
Sugar 32% 0% ±0.2 % 0.2 % - Optical - - - 1-1/2 (Dia.) x 6-3/4mm 170.1g - 6-3/4in
RS庫存編號 685-768
製造零件編號52060
BrandRocol
HK$1,821.65
單位
Grinding Fluids, Mix Cutting Fluids - - - - - - - - - - - - -
RS庫存編號 899-8012
製造零件編號ORA 1SA
BrandKern
HK$1,151.66
單位
Salt 100% 0% - - - Analogue - - - - - - -