Beautiful, Functional Design.   User-Tested Ease of Use.
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Digital Refractometers RX-α series Features

The World's Highest Standard of Technology Stemming from Over Half a Century of Expertise

The World's Highest Standard of Technology Stemming from Over Half a Century of Expertise

World's Highest Standard of Accuracy

The RX series are the most accurate of ATAGO refractometers programmed with a trusted and advanced algorithm. The epitome of which boasts the accuracy of ±0.000010 nD and ±0.005% Brix.

Main Features

  1. Visual "Pass/Fail" Indication

  2. Programmable User Scale

  3. Password Security

FDA 21 CFR Part 11

Software is available to support your FDA 21 CFR Part 11 compliance.


Ergonomically Designed Layout

The RX- a series was designed with ease of use in mind. Extensive research was performed in the design phase to ensure an ergonomic interface that made operation easy while maximizing efficiency.

4 Measurement Mode Options

For maximum accuracy
Displays the measurement value once the sample reaches the target temperature.
For no temperature control
Provides an option to turn the thermo-module off. Without temperature control, the measurement value is displayed in 4 seconds after the START key is pressed.
For fast results
Measures refractive index and temperature at fixed intervals and displays the estimated measurement value at the target temperature.
For emulsion samples
Displays the measurement value once a certain level of sample stability is achieved.

Tried, tested, and proven features and design

Digital Refractometers RX-α series Application Examples

Refractive Index

Refractive Index is a common quality standard measure for pharmaceutical or chemical products. Measurements need to be taken at a constant temperature, commonly 20°C, 25°C, and 40°C. The RX-α units are equipped with the internal Peltier Thermo-Module, and measurement starts once the target temperature is reached.

  • Fragrance and Food Additives
  • Pharmaceutical Products
  • Cosmetics
  • Petroleum and Organic Solutions
  • Oils and Fats
  • Detergents


Brix is measured for quality control purposes in the food and beverage industries. The RX-α units are widely used for fruit juice, condiments, jams, and honey. The RX-007α (minimum indication 0.001% Brix) is used for tea and unsweetened drinks.

  • Beverages and Fruit Juice
  • Jams, Honey, Liquid Sugar, Syrups
  • Condiments, Sauces, Soups


The concentrations of industrial solutions are often monitored. Examples include water-based cutting oils and cleaning solutions, hydrogen peroxide, coolants, and alcohol solutions. Although the Brix scale is commonly used, user scales can also be programmed to display converted sample values.

  • Chemical Solutions
  • Cutting Oil andQuenching Oil
  • Antifreeze and Coolants

Digital Refractometers RX-α series Measurement Method

4 easy steps

  • Place a sample on the prism.
  • Press the START key to start a measurement.
  • Measurement value is Displayed.
  • Wipe off the sample to clean.

Digital Refractometers RX-α series Line-up

  • RX-5000α-Plus

    The world's highest level of accuracy Brix: ±0.010%, Refractive Index: ±0.00002. Brix value displayed to the 3rd decimal place.

  • RX-5000α-Bev

    Developed with the beverage industry in mind. Easy-to-clean flat sample stage. Quickly measure a sample after another.

  • RX-7000α

    A wide Refractive Index range: 1.3250-1.7000 with Automatic Temperature Compensation up to 70°C.

  • RX-9000α

    Equipped with the accuracy of the RX-5000α combined with the wide Refractive Index range and temperature control of the RX-7000α.