Technical Specifications

The DR201-95 is a compact digital handheld refractometer from A.KRÜSS Optronic, built for refractive index and sugar content measurement wherever the sample is. It runs on a single AAA battery, weighs 180 g, and fits in a pocket. The measuring trough is fully chrome-plated with an optical flint glass (SF4) contact surface, and the housing meets IP64 for splash resistance. One button starts the measurement, and the result appears in about a second after temperature equalisation, with automatic temperature compensation on the %Brix scale. The specifications below cover the standard unit.

Model/Part Number: DR201-95

Measurement Performance

• Measurement principle: digital refractometry, critical angle method

• Refractive index range: nD 1.3330–1.5318

• %Brix range: 0–95 %Brix

• Refractive index accuracy: ±0.0003 nD

• %Brix accuracy: ±0.2 %Brix

• Refractive index resolution: 0.0001 nD

• %Brix resolution: 0.1 %Brix

• Measurement period: approx. 1 second after temperature equalisation

• Minimum sample volume: 0.3 ml

• Scales: refractive index (nD), sucrose concentration (%Brix)

• Temperature compensation: automatic, 10–40 °C, %Brix scale only

• Reference conditions: λ = 589 nm, 20 °C, 1013 hPa, 50 % relative humidity

Temperature Measurement

• Temperature accuracy: ±0.5 °C

• Temperature resolution: 0.1 °C

Physical and Operational

• Sample contact parts: optical flint glass (SF4), fully chrome-plated surface

• Operation: membrane keypad

• Adjustment: via membrane keypad

• IP rating: IP64, splash-proof

• Dimensions (W x H x D): 130 x 80 x 40 mm

• Weight: 180 g

• Power: 1.5 V, 1x AAA battery

Standards and Application Areas

• Relevant norms referenced for application: AOAC, OIML, ASTM, DIN, CID; pharmacopoeias BP, JP, Ph. Eur.; GLP

• Typical sectors: food and beverage, pharmacy, food production, automotive and mechanical engineering, pharmaceuticals, chemical industry

Standard Accessories Included:

• DR201-95 digital handheld refractometer

• 1x AAA battery

• Operating manual

• Factory calibration certificate

Items Excluded:

• Calibration standards (nD 1.3400, 1.3900, 1.4300 available separately, each at 25 °C)

• Carrying case

• Additional batteries

• Extended warranty beyond standard terms

Pre-installation Requirement:
No installation is required. Insert the AAA battery, allow the instrument to reach ambient temperature if stored in a colder or warmer environment, and perform an adjustment with a certified standard before first use. Keep the measuring trough clean and dry between samples, and avoid immersing the housing beyond the IP64 rating.

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Why This Handheld Refractometer Earns Its Place on the Bench and in the Field

Most refractometers ask you to trust your eye against a shadow line. The DR201-95 digital handheld refractometer removes the interpretation step entirely. You place about 0.3 ml of sample in the chrome-plated trough, press a button, and the digital display shows the refractive index or %Brix value. Two operators reading the same sample get the same number, which is the point.

The range is unusually wide for a handheld. From nD 1.3330 to 1.5318 and 0 to 95 %Brix, the same instrument covers sugary beverages, confectionery, pharmaceutical infusion solutions, and chemical raw materials. Automatic temperature compensation on the %Brix scale keeps results stable when the ambient temperature moves, and the IP64 housing handles the splash that comes with real sample handling.

For buyers sourcing through OS4U, the accessory decision is mostly about calibration standards and whether a carrying case belongs in the kit. The KRÜSS DR201-95 page lists the current standards and accessories.

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Key Benefits

Results that do not depend on the operator

The DR201-95 portable refractometer captures the measurement digitally, so there is no shadow line to interpret and no reading to argue about. Accuracy of ±0.0003 nD and ±0.2 %Brix holds across users with different levels of experience, which is what makes the result validatable.

Wide range in a pocket-sized body

Refractive index from 1.3330 to 1.5318 and %Brix from 0 to 95 cover a broad sample portfolio on one instrument. At 180 g and 130 x 80 x 40 mm, it goes to the production line, the receiving bay, or the tanker truck without a bench to sit on.

Temperature compensation that stabilises the reading

Automatic compensation on the %Brix scale across 10–40 °C keeps results reproducible when the room, the sample, or the season changes. The temperature reading itself resolves to 0.1 °C with ±0.5 °C accuracy.

Fast measurement, small sample

About one second per measurement after temperature equalisation, with a minimum sample volume of 0.3 ml. For samples that are expensive or limited, that small volume matters.

Cleaning that takes seconds

The fully chrome-plated measuring trough has a smooth contact surface that wipes clean without crevices. Quick filling and quick cleaning keep the instrument moving between samples.

Built for real handling

IP64 splash resistance, a robust housing, and a single AAA battery. No charging dock, no cable, no software. The instrument works where it is needed.

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Solving the Problems That Slow Refractometry Down

Struggling with readings that vary between operators? Digital capture with no shadow line to interpret removes the subjective step. The same sample gives the same displayed value regardless of who runs it.

Losing accuracy when the room temperature shifts? Automatic temperature compensation on the %Brix scale, from 10 to 40 °C, holds the result steady as ambient conditions change.

Need to measure away from the bench? At 180 g with a battery power supply and IP64 housing, the instrument travels to incoming goods, the production line, or a delivery point without a power outlet.

Running samples in short supply? A minimum sample volume of 0.3 ml means the measurement does not consume the sample budget.

Juggling multiple sample types on one device? The 1.3330–1.5318 nD and 0–95 %Brix range covers food, beverage, pharmaceutical, and chemical samples on a single instrument.

Worried about calibration traceability? Certified calibration standards at nD 1.3400, 1.3900, and 1.4300 (25 °C) are available separately, and adjustment runs from the membrane keypad.

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Warranty & Support

We provide a 1-year manufacturer’s warranty covering parts and labor. Technical support, installation assistance, and operational training are also available. Replacement parts and consumables are available throughout the product’s service life.

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