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Refractometer Overview

Refractometer Models by Rudolph Research Analytical

Select a Refractometer for your demanding Laboratory application from the wide range of instruments available from Rudolph Research. Rudolph is a leading analytical laboratory instrument supplier, manufacturing precision quality benchtop instruments for the Pharmaceutical, Chemical, Petroleum, Petro-Chemical, Food, and Beverage industries. All our instruments are designed to meet specific application requirements of specific industries and all are designed to exceed your requirements. We offer a range of models and numerous configurations and are pleased to advise you as you make a purchase decision for your laboratory.  

Product Category: Refractometers

Industry: Biodiesel/Petrochemical, Food, Dairy and Wine, General Laboratory, Pharmaceutical, Personal Care and Natural Products

Supplier: Rudolph Research Analytical



Refractometer Selection, by industry or application, see the Rudolph Refractometer Selection Guide

Refractometer: Watch a video about the Rudolph Research line of Automatic Refractometers

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Refractometers From Rudolph Research All Feature:

  • Easy to clean, shallow Sample well – A clean sample well is imperative to accurate measurements.
  • Durable Sapphire Prisms with Long-life Light sources – Low Life of instrument cost.
  • 3 Year Domestic Warranty, Up to 3 International Warranty
  • Sales and local service located near your lab anywhere in the world.
  • Decades of leading Analytical Instrument Design and Support.

High Durability Sapphire Prism

All Rudolph Research J-Series instrument offer a sapphire prism for high mechanical and chemical durability. The sample well is acid resistant 316 stainless steel with a Techtron sealing ring. There is no lamp to change, the LED light source is guaranteed for 1,000,000 measurements.

Shallow Refractometer Sample Well – All Rudolph J-Series Models

Refractometer measurement accuracy is only as reliable as the cleanliness of the sample well. Hard to clean sample wells can lead to inaccuracies due to residual from a prior measurement. Rudolph Research set out to dramatically minimize this problem by taking a new approach to sample well design. The Rudolph sample well is very shallow and smooth allowing easier cleaning and less surface area for contaminants to hide. Less sample is required and the well cleans easily. The result is more accurate measurements due to significantly less opportunity for sample contamination.

Refractometer Sample Well

Refractometer – Sample Temperature Control

Rudolph’s uniquely designed refractometer sample well and electronic heating and cooling system improves results. For many applications sample temperatures must be accurately controlled within the sample well. When an application requires highly controlled temperature, a temperature controlled presser will assure even and highly accurate temperature stability.  A sample in the measurement well that is controlled from both the top and bottom affords the most accurate measurement at a required temperature.

Refractometer - Sample Well
Refractometer - Sample Well Cross Section

Refractometer Models – 10 Models with dozens of application specific options.

Rudolph understands your measurement applications and provides the needed instruments and configurations to meet your requirements. Application requirements may be dictated by regulatory agencies, quality control demands, or sample handling concerns. Refractometers may also be utilized in conjunction with other instruments for multiple measurements – load one sample to receive multiple measurement results. Sample delivery may also automated with or without other instruments for a complete Laboratory Automation solution designed to increase efficiency in your laboratory.

Laboratory Refractometer – Model J457 – Our Most Advanced Model – For Very demanding Pharmaceutical, Analytical, and Chemical Labs.

J457 Refractometer

  • Smart Measure™ Improves Results with Live Measurement and Sample Load Well Monitoring.
  • Dual Electronic Temperature Control  – Range 10ºC – 110ºC or 10ºC – 120ºC (optional)
  • Accuracy: Refractive Index ±0.00002, BRIX ±0.01
  • Fully 21 CFR Part 11 Compliance and On-Board Data Storage
  • Widest Measurement Range: Refractive Index 1.26 – 1.72, BRIX 0 – 100
  • Data Storage – 32GB non-removable Compact Flash – Or Fully Networkable
  • Read more about the J457 Refractometer

Refractometer – Model J457 NDR – Hospital Refractometer Ideal For Drug Dispensing Pharmacies

Refractometer – Model J357 – Excellent for Pharmaceutical, Chemical, Petroleum, Essential Oils, Fragrance, Cosmetic Laboratories.

Laboratory Refractometer - J357

  • Dual Electronic Temperature Control  – Range 15ºC – 100ºC or 10ºC – 120ºC (optional)
  • Accuracy: ±0.00004 RI, ±0.03 BRIX
  • High Durability Sapphire Prism
  • Data Storage: Removable media card or upload via RS 232 to LIMS systems
  • Read more about the J357 Refractometer

Wide Range Refractometer – Model J257 – High Accuracy – Wide Range for Polymer, Petroleum, Chemical, Pharmaceutical, Essential Oil Laboratories.

Laboratory Refractometer J257

  • Wide refractive index range of 1.26-1.72 measures beyond instruments with only a food refractive index range of 1.33-1.53
  • Measures aromatic essential oils, fluorocarbon solvents, and all known materials.
  • Large, easy to read, 7.5cm x 10cm cold cathode fluorescent back lit, digital LCD Screen
  • Read more about the J257 Refractometer

Digital Refractometer – Model J157 and J157-633 – High Accuracy for Food, Beverage, Water Based Chemicals, & Sugar Industries.

Refractometer J157

  • Measures to ±0.00002 RI / ±0.01 BRIX making it more accurate and reproducible than 4 decimal place wide range chemical refractometers.
  • Dual Electronic temperature control from the top and bottom of the sample well.
  • Large range of standard and customized scales are available.
  • Large, easy to read, 7.5cm x 10cm cold cathode fluorescent back lit, digital LCD Screen
  • J157-633 operates at 633nm for OWLS system Bio-technical and Bio-engineering labs.
  • Read more about the J157 Refractometer

Refractometer – Models J57HAJ57WRJ57TPN Refractometer Heavy Use, High Accuracy, QC.


Refractometer – Model J47, When QC Counts, Ideal for Food and Beverage


  • Precision lab refractometer with traceable calibration.
  • Stores measurement electronically.
  • On-board temperature correction tables for sugar and water based samples.
  • Read more about the J47 Refractometer

Excellent for QC when Quality is truly important in the Food and Beverage product industry.

All Rudolph Instruments carry our exclusive 20 Commitment to service your instrument.

Rudolph Research Analytical offers a comprehensive range of Preventive Maintenance and Service Programs. Rudolph has demonstrated a commitment to its customers by keeping installed instruments operational, not only for 20 years, but in some cases for over 40 years. This long-term commitment to keeping our instruments running makes the cost of ownership, over the life of a Rudolph Instrument, one of the lowest in the laboratory market segment. At the date this document was published, there is no other laboratory instrument manufacturer guaranteeing service and technical support for 20 years. View the entire 20 Service Guarantee. 

Scientific Solutions

Scientific Solutions have been providing carefully selected laboratory and analytical equipment to Australian Industries such as Environmental, Pharmaceutical, Food and Beverage and Research markets of the Science Industry for over a decade.

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