Refractometers — Optical & Digital, Brix, Salinity, Automotive Fluid & Custom Scales

Handheld optical and digital refractometers for Brix, salinity, alcohol, automotive fluids, dairy, clinical and fully customizable scale applications.

Optical vs. digital refractometer: how to choose

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Refractometer range

What is an optical (handheld) refractometer?

An optical or handheld refractometer is an analog instrument that needs a bright, natural light source to measure a liquid's refractive index. A drop of the sample liquid is placed on the glass sensor prism, and the reading is taken by eye against a printed internal scale, viewed through an eyepiece. Optical refractometers are compact, need no batteries, and are ideal for laboratory, industrial and production-line spot checks — though they are less precise than digital models. Typical uses include calculating the Brix value of fruit juices, crops, soft drinks, sauces, soups, water-soluble cutting oils, washing liquids and industrial coolants. Each model is calibrated to a specific measurement: a salinity refractometer measures water salt content and cannot be used for fruit juice, for example, so matching the model to the application matters.

What is a digital refractometer?

A digital refractometer uses an electronic light sensor rather than the human eye, giving a higher resolution and generally more accurate reading than an optical model. A good digital refractometer includes automatic temperature compensation, correcting for the effect that sample temperature has on refractive index, and typically offers a wider scale range with far higher resolution and precision than an equivalent optical unit.

Applications: what refractometers are used for

Refractometers are used across an unusually wide span of industries because refractive index is such a fast, non-destructive way to check concentration. In fruit and beverage production, a Brix refractometer checks ripeness before harvest and sugar concentration during processing — including South African sugar-cane operations checking cane juice Brix before cutting. In viticulture, the same principle reads must weight on scales familiar to the wine industry, such as degrees Oechsle (°Oe) used in German-style wine grading or KMW (the Austrian sugar unit), letting a cellar track ripeness through harvest. In vehicle maintenance, a combined refractometer reads car battery acid specific gravity, AdBlue (vehicle urea) concentration and ethylene or propylene glycol antifreeze strength from the same handheld unit, avoiding the need for three separate hydrometers. In veterinary and clinical settings, a serum-protein and urine specific-gravity refractometer gives an instant reading from a single drop of blood serum or urine, used both in animal health checks and human clinical work. In food and dairy QC, digital Brix and glycol refractometers verify concentration in honey, jam, dairy products and processing-line coolants to a tighter tolerance than optical models allow.

Customizable digital refractometer — programmable scale reference

The MSDR-P2 customizable digital refractometer can be programmed for the scales below in addition to its standard RI and %Brix readings — up to ten scales total (two normally reserved for RI/Brix, so effectively eight more can be added, though this gets cluttered in practice). Programming beyond the first four scales carries a once-off setup cost and is best specified at initial purchase; the RI/Brix scales can be removed if not required, though most customers leave them active. As a general rule for selecting the correct base model: if the target refractive index is below 1.42432, use the LOW (50) range model; at 1.42432 or higher, use the HIGH (90) range model.

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Scale table sourced from Ecotao's programmable refractometer specification sheet. Confirm the exact scale and model combination with our team before ordering — some scale/range pairings require the 50 (LOW) model and others the 90 (HIGH) model as noted above.

Full product list & direct store links

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Atago PAL series — specialty scales

Atago is a leading global refractometer brand, and Ecotao can supply PAL-series models covering nearly every application. The range spans general-purpose models (PAL-1, PAL-2, PAL-3, PAL-α, PAL-H, PAL-S, PAL-BX/RI, PAL-RI, PAL-Loop), a COVID-era disinfection series (ethyl alcohol, hypochlorous acid, peracetic acid), and dedicated special-scale models for coffee, pâtissier work, honey moisture, brine, ramen, soy milk, condiments, cutting oil, urea, hydrogen peroxide, urine specific gravity, ethylene glycol, sodium hydroxide and general cleaning agents. These are quoted on request rather than carried on the online store — contact us with the specific application and we'll confirm the right PAL model.

Frequently asked questions