Atago 2371 MASTER-10α Hand-Held Refractometers MASTER series , Brix : 0.0 to 10.0% Measurement Range

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Ultimate Functionality , Unsurpassed Quality, Seamless Usability

Due to many requests, we are bringing back the MASTER-10 series!

MASTER-10 series is suitable for particularly low concentrations of Brix 10% or less, such as tomato juice, vegetables, soups, cleaning solutions and cutting oil. The temperature correction function allows accurate measurement without worrying about sample temperature. It also has a water protection function, so you can safely use it on site. MASTER-10α is made of metal and MASTER-10Pα is made of resin. For samples containing salt and acid, please choose a resin model.


  • Soft Drink
  • Soup
  • Fruits & Vegetables
  • Cutting Oil 
  • Cleaning Agent etc
RangeBrix : 0.0 to 10.0% (Automatic Temperature Compensation)
Minimum ScaleBrix : 0.1%
AccuracyBrix : ±0.2% (10 to 30゚C)
RepeatabilityBrix : ±0.1%
International Protection ClassIP65 (except eye piece)
Dust-tight and Protected against water jets.
Dimensions & Weight3.2×3.4× 20.3cm, 155g

Design Registration No.000379326-0001, 000379326-0002 (EU)
ZL 2005 3 0116403.4,5 (China), D111526 (Taiwan), D555, 549 (U.S.A.),
1255763, 1255764, 1255765, 1255766, 1255767 (Japan)
Patent Granted in countries around the world.

  • £300.00

Product Line-Up

Reason to choose MASTER series

Water resistant(α & H series)

Water resistant

"Washable". A special design concept for analog type measuring instruments. It is a new mechanism that can be washed even under running water after measurement.



The readability of measured values is the "lifeline" for hand-held refractometer.Not only the brightness of the entire field of view, but also the clarity of the boundaries represents the basis of the optical technology that ATAGO has reached.

Contamination free

Contamination free

Uses a smooth grip with no irregularities. The carbon-like design contributes to both cleanliness and playfulness.

ATC Temperature compensation(α・H・T series)

The measured value are automatically corrected according to the environment. We have thoroughly improved the structure and arrived at a mechanism, patented that is not found anywhere else.

Function and Design


Measurement Method

    • SKU
    • Commodity Codes
  • Measurement Range
    Brix : 0.0 to 10.0%
  • Resolution
  • Measurement Accuracy
  • Ambient Temperature (°C)
    10 to 30
  • Body Material
    Metal body : Die-cast aluminum, Ideal for the agriculture industry, metal working fluids and various high-temperature samples
  • Other Features
    α : Water resistant (IP65)
  • Use
  • International Protection Class
  • Manufacturer
    Atago Co Ltd
  • Country of Origin


The name "MASTER" says it all. The MASTER series integrates 76 years of manufacturing expertise into these state-of-the-art instruments. The researchers at ATAGO have addressed the requests of users in 154 countries around the world, and the MASTER series is the embodiment of this extensive research and development. The MASTER series rates 100% in fulfilling both user expectation and illustrating ATAGO's researchers' desire to design the best hand-held refractometer possible.

1. Water Resistant

The concept of a washable hand-held analog unit is exceptional. After measuring, you can clean it with running water under a faucet. The new structural-design of these units allows them to be washed whenever necessary. The MASTER Series is the epitome of user friendliness.

2. Visibility

Efficiently using an analog unit depends on how easily the measured value can be read. With extensive research and the utilization of quality optics, the result is a view of the measurement scale that is very bright, creating a high contrast to see clearly where the boundary intersects the memory lines of the scale. The scale numbers are also large and easy to read. Imitation instruments produced in China cannot compare to the durability, quality or accuracy of ATAGO instruments. Maintaining high standards of quality and attention to detail is the difference which is as clear as the scale of the MASTER units.

3. Contamination Free

The MASTER Series was also designed with a smooth and easy-to-clean grip, eliminating the possibility of food and other samples being trapped which can result in contamination and bacterial growth. The steel and carbon-fiber design is both functional and stylish.

4. Automatic Temperature Compensation

The Automatic Temperature Compensation (ATC) system was also reviewed and improved. This new system allows the MASTER series to have improved accuracy that out performs similar units. While developing the MASTER series, there were many discussions, data gathering of countless tests, and repeated setbacks that our development team had to - and did - overcome. Through this process, ATAGO has applied for a patent on the design of the improved ATC system. Ultimately, the MASTER series reads more accurately than any comparable unit in the market.

5. Endurance

The MASTER Series has passed all water resistance, dust resistance, and drop tests. Instruments were subjected to water jets from four directions, dropped from a height of one meter onto an oak platform, and withstood the pressure changes of air travel. The only replacement part for the MASTER series is the daylight plate and the instruments do not utilize consumable parts or materials, thus keeping the cost for replacement parts to a minimum.

6. Automatic Sample Distribution (ASD)

People who frequently use refractometers have noticed that the daylight plate can get in the way when placing a sample on the prism. To address this problem, ATAGO has developed a spoon-shaped tip, which makes applying the sample easy, and helps to spread the sample across the prism on its own. This makes the instrument even more user-friendly. (Patent Granted)

7. Repair and Service

ATAGO has established a close network of customers by providing excellent customer service support. When an ATAGO instrument needs servicing, not only is each customer treated with respect, but they are also provided with detailed methods and user-specific suggestions on sampling and taking measurements, based on individual needs. ATAGO has refined our user-friendly approach not only to improve our instruments, but to also support our valued customers. ATAGO has many excellent Authorized Service Centers worldwide.

8. Reputation for Quality

ATAGO has built a firm reputation for reliability and quality during its 76-year history. We are a strong company that exports to over 154 countries with continued growth expectations. We have received ISO certification, and our integrated system for producing and marketing our products, based on the "Plan-Do-Check-Act" cycle, is essential in promoting the ATAGO name.
ATAGO products have been awarded “AAA”, the highest rank offered by Standard & Poor's Japan SME Grading for 2 consecutive years.

We at ATAGO are confident that the MASTER series will surpass your expectations.