Automatic Density Meter

The Rudolph DDM 2911 Plus / 2911 / 2910 / 2909 Density Meters have the features to meet all the present day industrial needs.

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Digital Refractometer

Rudolph have a large bouquet of various models of Refractometers to choose from. It varies depending on the application, the RI range, accuracy, budget among others.

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Digital Polarimeters

Rudolph manufactures various models of Polarimeters depending on accuracy, resolution, application, Temperature maintenance and budget. They vary from Autopol I to Autopol VI

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AUTOPOL VII Automatic Polarimeter

Rudolph’s latest in the series of Polarimeter - Autpol VII comes with fully automated sample loading combined with versatile sample loading, cell cleaning, rinsing, and drying built-In quartz plates automatically performing 3 point validation etc. comes as a total package.

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Portable Brix Meter

KEM, Japan Brixmeter model BX-1 is an automatic, digital system with an LCD display. The range is continuous between 0 – 85%Brix. The resolution is 0.1%Brix. This system is equipped with temperature compensation and has an IP-65 protection. This means that the system can be washed under the tap directly for cleaning the previous sample.

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Portable Density Meter

The KEM, Japan portable Densitymeter model DA-130N is a microprocessor controlled system with an LCD display. It operates out of the ASTM approved "oscillation of the U-tube" method. It displays Density, Temperature-compensated Density, Specific Gravity, Temperature-compensated Specific Gravity, Brix%, Alcohol Concentration, Sulfuric Acid Concentration, API degree, Baume degree, Plato degree, Proof degree etc.

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Portable Refractometer

KEM, Japan portable Refractometer model RA130 is a light-weight, easy-to-use and a handy system. It is a microprocessor controlled instrument with an LCD display. The sample can either be dripped on the prism or the prism of the system can also be dipped into the sample beaker to measure RI. Since the system is IP-65 protected the system can be directly immersed into the sample beaker also.

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Texture Analyser

Shimadzu Texture Analyser is ideal and effective for testing Food (Texture Profile Analysis), Pharmaceutical Substances, Packaging materials, Medical Devices etc.. It can be fixed with a variety of jigs and fixtures. For the Food Industries many parameters including Hardness, Brittleness, Adhesiveness, Cohesiveness, Elasticity, Rubberness, Chewability etc. can be obtained from the user friendly software Trapezium X Texture

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Universal / Tensile Testing Machine

Shimadzu Universal Testing Machine helps you to determine Tensile strength , Shear Test , Elongation Test for various materials which includes metals , plastics , rubber , wires etc .

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Contact Angle Meter

Kyowa Contact Angle Meter can perform Sessile Drop Method, Extension/Contraction method, Surface / Interfacial tension of liquids with Pendant drop method, Sliding Method & Dynamic Sliding Method. Model DMe-701 is the most automatic model and even stage movement and Droplet deposition are controlled through the PC. Right from the basest of models right upto Model DMe-701 are available depending on the application, capabilities, budget etc..

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Surface Tensiometer

Surface Tensiometers are widely used to check Surface Tension of Paints , Inks , Additives , Surfactant etc & same instrument is also used for the measurement of IFT - INTERFACIAL TENSION. The Interfacial Tension is mostly used in the study of quality of Transformer Oil.

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Mark-10 Corporation is a world-renowned manufacturer of Force and Torque measurement products. Their product profile includes Force gauges, Torque gauges, Test stands (manual), Test stands (motorised) and Force/Torque indicators.

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Polarimetry Fundamentals

Polarimetry is a sensitive, nondestructive technique for measuring the optical activity exhibited by inorganic and organic compounds. A compound is considered to be optically active if linearly polarized light is rotated when passing through it. The amount of optical rotation is determined by the molecular structure and concentration of chiral molecules in the substance. Each optically active substance has its own specific rotation as defined in Biots law:

[α] = specific rotation, T = temperature,
λ = wavelength, α = optical rotation,
c = concentration in g/100ml, l = optical path length in dm.

Historically, polarimetry was performed using an instrument where the extent of optical rotation is estimated by visual matching of the intensity of split fields. For this reason, the D-line of the sodium lamp at the visible wavelength of 589nm was most often employed. Specific rotation determined at the D-line is expressed by the symbol:

alt or alt

and much of the data available are expressed in this form. Use of lower wavelengths, such as those available with the mercury lamp lines isolated by means of filters of maximum transmittance at approximately 578, 546, 436, 405, and 365nm in a photoelectric polarimeter, have been found to provide advantages in sensitivity with a consequent reduction in the concentration of the test compound. In general, the observed optical rotation at 436nm is about double and at 365nm about three times that at 589nm. Reduction in the concentration of the solute required for measurement may sometimes be accomplished by conversion of the substance under test to one that has a significantly higher optical rotation. Optical rotation is also affected by the solvent used for the measurement, and this is always specified.

It is not common practice to use other light sources, such as xenon or tungsten halogen, with appropriate filters, because these may offer advantages of cost, long life, and broad wavelength emission range over traditional light sources.

- USP<781> (Download PDF)

The polarimeter must be capable of giving readings to the nearest 0.01°. The scale is usually checked by means of certified quartz plates. The linearity of the scale may be checked by means of sucrose solutions.

- EP 2.2.7 (Download PDF)

The polarimetric method is a simple and accurate means for determination and investigation of structure in macro, semi-micro and micro analysis of expensive and non-duplicable samples. Polarimetry is employed in quality control, process control and research in the pharmaceutical, chemical, essential oil, flavor and food industries. It is so well established that the United States Pharmacopoeia and the Food & Drug Administration include polarimetric specifications for numerous substances. 


Research Applications
Research applications for polarimetry are found in industry, research institutes and universities as a means of:

  • Isolating and identifying unknowns crystallized from various solvents or separated by high performance liquid chromatography (HPLC).
  • Evaluating and characterizing optically active compounds by measuring their specific rotation and comparing this value with the theoretical values found in literature.
  • Investigating kinetic reactions by measuring optical rotation as a function of time.
  • Monitoring changes in concentration of an optically active component in a reaction mixture, as in enzymatic cleavage.
  • Analyzing molecular structure by plotting optical rotatory dispersion curves over a wide range of wavelengths.
  • Distinguishing between optical isomers.

In each of these applications, the AUTOPOL offers up to six discrete wavelength selections to observe the effect of wavelength upon an optically active substance.

Quality and Process Control Applications

Quality and process control applications, both in the laboratory or on-line in the factory, are found throughout the pharmaceutical, essential oil, flavor, food and chemical industries. A few examples are listed below. 

Pharmaceutical Industry

Determines product purity by measuring specific rotation and optical rotation of:

  • Amino Acids
  • Antibiotics
  • Dextrose
  • Steroids
  • Amino Sugars
  • Cocaine
  • Diuretics
  • Tranquilizers
  • Analgesics
  • Codeine
  • Serums
  • Vitamins

Flavor, Fragrance, and Essential Oil Industry

Utilizes polarimetry for incoming raw materials inspection of:

  • Camphors
  • Gums
  • Orange oil
  • Citric acid
  • Lavender oil
  • Spearmint oil
  • Glyceric acid
  • Lemon oil

Food Industry

Ensures product quality by measuring the concentration and purity of the following compounds in sugar based foods, cereals and syrups:

  • Carbohydrates
  • Lactose
  • Raffinose
  • Various starches
  • Fructose
  • Levulose
  • Sucrose
  • Natural monosaccharides
  • Glucose
  • Maltose
  • Xylose

Chemical Industry

Analyzes optical rotation as a means of identifying and characterizing: 

  • Biopolymers
  • Natural polymers
  • Synthetic polymers



J57AB/J157AB Refractometers for measurement of urea concentration in diesel engine additives


Designed specifically for the measurement of urea in diesel engine additives, in accordance with DIN 70071 and ISO 22241-2.

Basic Operation

The J57AB is a sub-model of the J57HA and most details on Technical Bulletin 915 apply. The J157AB is a sub-model of the J157 and most details on Technical Bulletin 911 apply. The differences between the AB models and the standard models are:


Both instruments have improved temperature performance to better than 0.02° C, meeting the requirements of DIN 70071 and ISO 22241-2.


The J57AB displays results in refractive index and the operator uses that result to calculate the wu number; and the J157AB has the calculations built-in to display and print the wu number.

Optional Accessories

The J Series AB refractometers can be supplied with the same range of accessories as the standard J Series, including:

  • Printers
  • Computer software
  • SD card drive
  • Barcode reader
  • Automatic sipping system
  • Autosampler

Brochure download

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The top-of-the-line J457 has many intelligent features built-in. The range is between 1.26 to 1.72RI and 0 - 100Brix. The accuracy is +/- 0.00002RI / +/-0.01Brix. The resolution is 0.00001RI and 0.01Brix. The temperature control range is between 10 deg C to 110 deg C and with temp. boost option it would be upto 120 deg C. This system would have an 8GB non-removable Compact Flast as internal memory.

Through the Smart Measure, the 457 has many intelligent features including Dirty prism detection, Incorrect calibration, Insufficient sample load, Cross contamination, Improper water zero, Trapped air bubble etc..

This system can also be made as a wall mount configuration in order to suit to production environments.

The 457 can also be upgraded with kits for Solids, Semi-Solids and Films.


Smart Measure™ Technology Improves Results!

All J457's come with Smart Measure™ Technology that automatically detects when the prism is improperly cleaned, insufficient sample is loaded, or if the instrument is improperly calibrated.

The J457 Smart Measure™ Advantage

Measurement problem:


Sample residue is left on prism surface

Experience has shown that incorrect measurements are often linked to cross contamination caused by the previous sample being inadvertently mixed with the current sample being measured. Ensuring that the prism surface is properly cleaned between measurements can be difficult for busy environments where multiple operators are involved.

Smart Measure™ solution:Automated clean prism monitoring

Smart Measure™ knows when the prism is clean. If the prism surface does not produce the correct "Clean Prism" result then Smart Measure™ notifies the operator that further cleaning of the prism is necessary. Smart Measure™ notifies the operator that it is ready to measure after the prism is satisfactorily cleaned.

Measurement problem:

alt  An insufficient amount of sample covering prism surface

 A small drop of sample in the center of the prism will measure correctly. A large drop of sample completely covering the prism surface will measure correctly. A small drop on the perimeter of the prism will produce erroneous results.

Smart Measure™ solution: Automated sample load monitoring

Smart Measure™ knows when a sample has been loaded on the prism and immediately begins evaluating various metrics surrounding the sample load. If Smart Measure™ determines that those metrics indicate proper sample loading, it will display the result with a sample quality number. If Smart Measure™ determines that the metrics indicate an improper sample load, Smart Measure™ will ask the operator to clean the prism and re-load the sample.

Measurement problem:

alt Sample contamination or improper calibration

 An improperly cleaned prism, where sample residue is left in the measurement well, can mix with a water zero or calibration fluid. This type of contamination during the calibration process will cause an error across all subsequent measurements.

Smart Measure™ solution: Automated sample calibration inspection

Smart Measure™ is constantly measuring the prism surface and monitoring the value measured against its database of results. If during a water zero the instrument detects a value that is too different from the database or the RI value being input is far from the measured value, it will alert the operator.

Measurement problem:

alt The sample has air bubbles that affect measurement results

 Many samples have air trapped inside them or are carbonated. These samples read well most of the time as long as air bubbles are not trapped between the prism surface and the sample. When this happens the operator gets an erroneous result often referred to as a flyer. These results are called flyers because the measured value is quite different from the expected measurement value.

Smart Measure™ solution: Automated sample calibration inspection

Smart Measure™ catches these flyers by scanning the detector for varying RI values and then alerts the user to reload the sample. Since the user does not get a value to record until a new sample load is completed, Smart Measure™ greatly reduces the erroneous measurements from being recorded.

Smart Measure™ Features

Smart Measure™ knows when to measure and display a result even when the operator does not.Smart Measure™ Features J457 (all models)
  • Dirty prism detection
  • Incorrect calibration detection
  • Insufficient sample load detection
  • Cross contamination detection
  • Improper water zero detection
  • Trapped air bubble on prism surface detection

Exclusive Dual Temperature Control System

All J457 models come with Rudolph's exclusive Dual Temperature Control System utilizing Peltier Technology. The J457 heats and cools the sample from both prism surface and sample cover. The insulating cover housing seals the Prism Well Ring to create a uniform temperature environment providing unmatched temperature control uniformity.

The J457 comes in three configurations to match your operating conditions J457-SC Standard Configuration


J457-SC Standard Configuration is Rudolph's most popular configuration and provides an excellent combination of a small footprint and a large, easy-to-navigate touchscreen interface.


J457-WC Wall Mount Configuration

J457-WC Wall Mount Configuration is designed for production environments where water is used for cleaning or there is a lot of sample spillage on the work surface. This configuration is also excellent for situations where there is very little work space available: out on the factory floor or in an over crowded satellite laboratory where there is little to no remaining bench space.


J457-FC Factory Configuration

J457-FC Factory Configuration is recommended when there is a lot of sample spillage on the laboratory's instrumentation. Factories working with sticky resins and syrups that end up being spilled on the instrumentation are great candidates for the J457-FC as the measurement unit can be as much as six feet away from the display unit.


J457 Automatic Refractometer Specifications (all models)

Measurement Scales Refractive Index (nD)
BRIX (% sucrose)
and up to 100 custom programmed scales
Measurement Range Refractive Index 1.26 - 1.70,
BRIX 0 - 100
Accuracy Refractive Index ±0.00002,
BRIX ±0.015
Reproducibility Refractive Index ±0.00002,
BRIX ±0.015
Resolution Refractive Index 0.00001
BRIX 0.01
Temp. Control Range 10°C to 100°C (wider temperature range available dependent on ambient conditions and options).
Temperature controlled by dual Peltier system.
Temp. Control Reproducibility ±0.01°C
Ambient Temp. Limit 5°C to 40°C
Temp. Correction Range 4°C to 95°C (for sucrose applications)
Sample Temp. Limit -20°C to 250°C
Optical Wavelength 589.3nm (NaD line)
Response Time User configurable, generally 30 seconds
Calibration Using water or NIST traceable fluids. Factory default calibration can always be reset
Prism Artificial Sapphire
Acid Resistance Hastelloy™ measurement surface (optional)
Data Storage/Internal Memory 8GB non-removable Compact Flash
Display 10.4 inch diagonal, 800x600 pixels, color, Flat Panel Monitor with Resistant Touch Screen Interface, 400 nits brightness, gasketted for spill protection.
User Interface Touchscreen
Communication Interface 3 USB, RS232 and Cat5 Network (Ethernet)
Operating Dimensions/Weight L: 17 ¼”, W: 12”, H: 13” / 23 lbs.
L: 43.5 cm, 30.5 cm, 33 cm / 10.4 kg
Power Requirements 100 - 240 volts, 50 Hz - 60 Hz

J457 Configuration Options
All models have Rudolph's exclusive Dual Temperature Control System with Mini Sample Environment
j457-fc-small j457-fc-small j457-wc-small


  • Completely integrated, single-unit design.


  • Splash proof measurement unit
  • Display unit with independent bench top option
  • Distance measurement unit can be from display unit: 3ft. or 6ft.


  • Splash proof measurement unit
  • Display unit with wall mount option
  • Distance measurement unit can be from display: 3ft. or 6ft.

Products and Accessories

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Why Agaram?

  • Instruments only from world-renowned manufacturers
  • Efficient after-sales service
  • Strong presence throughout India
  • Round the clock support via email and phone
  • Readily available instrument demonstration at a location of your choice

Demo Requisition


Seeing is Believing

Email us your details and we shall conduct a demo of our system at your facility.

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