Have one to sell? Sell on Amazon
by Atago

Atago 3281 RX-5000 Digital Benchtop Refractometer, Refractive Index: 1.32700 to 1.58000nD, 0 to 100% Brix

Price: $9,345.00 & FREE Shipping. Details
Note: Signature required upon delivery due to high value of this item. Details
Due to the value of this item, a signature is required at delivery to protect you from loss or theft.
Only 1 left in stock.
Ships from and sold by Amazon.com.

Specifications for this item
Brand Name Atago
Part Number 3281
Number of Items 1
Measurement Type Refractive index , Temperature
Overall Height 14  centimeters
Overall Length 37  centimeters
Overall Width 26  centimeters
Size 0 to 100% Brix
Temperature Range 5/40  Degrees Celsius
UNSPSC Code 41115312
Volume 0.02  milliliters


View our selection of refractometers, including digital refractometers, portable refractometers, sugar refractometers, and more.

Product Features

  • Benchtop refractometer for refractive index (1.32700 to 1.58000nD), Brix (0.00 to 100.00%), and concentration scale measurement of liquid and solid samples (in a sample well) such as food and beverages, in a 5 to 60 degrees C temperature range with high accuracy ( + or - 0.03% Brix, and + or - 0.00004nD)
  • Provides automatic measurement value (for 60 different kinds of user scales), and sample temperature reading, after sample reaches target temperature, and has automatic temperature compensation (ATC) for accuracy
  • Nozzle for connecting to water bath (not included) attachment
  • Digital, LED-illuminated, backlit display of refractive index (nD) and % Brix in degrees C, with a top and bottom limit bar for set control range in targeted temperature
  • Works with an AC 100V to 240V power source, has a 110V power connection cable with a 6-foot power cord, and can be calibrated with distilled water for ease of operation

Product Details

  • Shipping Weight: 19.4 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B004J4XDI4
  • Item model number: ATA-3281
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product Description

The Atago 3281 Rx-5000 is a digital benchtop refractometer for refractive index measurement (1.32700 to 1.58000nD), and Brix (0.00 to 100.00%) concentration of liquid samples, has a nozzle for connecting to a water bath (not included) attachment, LED digital display of temperature, and provides automatic measurement value and sample temperature. A refractometer measures the refractive index of a liquid or solid in a sample, converts it to concentration in units of percent by weight, and displays the results. Refractometers are commonly used in the optical, chemical, geological, ecological, culinary, food and beverage, pharmaceutical, and educational industries, and for water-testing applications.

This refractometer features a nozzle for connecting to a water bath (not included) attachment, rather than a built-in thermo module. The unit provides refractive index measurement in a measurement temperature range of 5 to 60 degrees C. It has high measurement accuracy (repeatability) of % Brix to two decimal places, and nD to five decimal places. The 3281 Rx-5000 provides automatic measurement value, and a sample temperature reading, after the sample reaches its target temperature. It has automatic temperature compensation (ATC) for accuracy. Sixty different kinds of user scales can be input, according to sample. The refractometer has a digital, LED-illuminated, backlit display of refractive index and % Brix in degrees C, with a top and bottom limit bar for set control range in targeted temperature. The unit can call up 30 of the latest measurements. It has a four-level password function system for internal and external security.

The 3281 Rx-5000 can be calibrated with distilled water. It is housed in a durable, die-cast aluminum metal body for resistance to heat and organic solvents. The sample well cover plate blocks outside light for measurement accuracy. The well is made of stainless steel 316 for durability. This refractometer can connect with an Atago digital printer, has an RS-232C connection port (used with a separately sold adapter), that works with RefractoSoft data transmission software (not included), compatible with Microsoft Windows XP, Vista, and 7, and complies with ASTM standards.


Measurement scale range Refractive index (nD) 1.32700 to 1.58000, Brix conversion 0.00 to 100.00%
Minimum detection scale Refractive index (nD) 0.00001, Brix conversion 0.01%
Accuracy (repeatability) Refractive index (nD) + or - 0.00004 (+ or - 0.00002), Brix conversion + or - 0.03%, (+ or - 0.01%)
Specimen measurement temperature range 5 to 60 degrees C
Water bath connection Nozzle
Ambient temperature 5 to 40 degrees C
Sample stage Flat
Light source and display type LED backlit (320 x 240 dpi), digital, degrees C
Power supply Instrument is compatible with 100V to 240V, 40/60 Hz, and comes with 110V power cord
Power consumption 30V amp
Refractometer dimensions 14 x 37 × 26 cm (H x W x D)
Refractometer weight 6.4kg


H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.

Refractometers are used to determine substance content in a sample, to provide unit readings of substances including Brix, salinity, and alcohol; to detect chemical impurities, or to measure components of samples such as industrial fluid. Refractometers measure the refractive index of a substance, which is its optical characteristic, and the number of dissolved particles in it. The refractive index is the ratio of the speed of light in empty space to the speed of light in a substance; when light passes from one medium to another. Generally, a low concentration sample has a larger angle of refraction than a high concentration sample. For example, a straw placed in a high-concentration substance appears more bent than when placed in a low-concentration substance. Refractometers can work with natural light, or with an external power source such as batteries or electricity. They typically have either a digital or analog reading display, though some units utilize both types. Some analog-display refractometers can be used for both solids and liquids. Digital-display refractometers are used exclusively for liquids. Types of refractometers include handheld, benchtop, and in-process. Handheld refractometers are elongated and telescope-shaped, or shorter and rectangular. Analog handheld refractometer readings are obtained by looking through the monocular eyepiece and viewing where the boundary line intersects with the memory line. Digital handheld models provide a digital readout. Benchtop refractometers typically measure with a higher degree of accuracy than handheld units. In-process refractometers are used for continuous process monitoring and data readouts, and are generally fitted into a piping system for ongoing analysis. Refractometers are used in a wide variety of applications in the culinary, food and beverage, pharmaceutical, educational, geological, chemical, ecological, and automotive industries, and for water-testing applications.

Atago Co., Ltd. manufactures analytical instruments such as refractometers, polarimeters, and saccharimeters, as well as a variety of meters. The company, founded in 1940 and headquartered in Tokyo, offers products that comply with Hazard Analysis and Critical Control Points (HACCP), Good Manufacturing Practices (GMP), and Good Laboratory Practices (GLP) system standards, and many International Organization for Standardization (ISO) standards.

What’s in the Box?

  • 3281 Rx-5000 refractometer
  • 110V power cord
  • Instructions

Customer Questions & Answers

Customer Reviews

There are no customer reviews yet.
5 star
4 star
3 star
2 star
1 star
Share your thoughts with other customers