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Visual Hand Held Refractometers

Portable range of ‘pocket’ size refractometers with over 70 models to suit most applications in the field…..

Our extensive selection of economic refractometers are used in many industries to make quick and easy measurements. All models are manufactured from brass with a satin chrome finish and have rubber-insulated grips, a zero adjusting screw for calibration and eyepiece focusing.

These simple, reliable hand held refractometers are suitable for fruit juices, jam, honey, soft drinks, ripeness of fruit, sugar content of beet and cane juices, sauces, soluble oils, detergents, anti-freeze and numerous other products.

Models with automatic temperature compensation (ATC) are ideal for varying temperature conditions during a production process.

Available Scales  :

  • Brix (% sucrose) – low or high range
  • Refractive index
  • Water in Honey
  • Salt (sodium chloride)
  • Salinity (of sea water)
  • Serum protein
  • Urine
  • Battery
  • Antifreeze
  • Alcohol (ethyl alcohol in water)
  • Alcohol (approximate % volume in wine)
  • Baume
  • Babo (Italian)
  • KMW (Austrian)
  • Oechsle
  • Urea Concentration(%DEF or AdBlue)



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Digital Hand Held Refractometers

Full range of ‘pocket’ size, high accuracy refractometers with over 10 models to suit most applications in the field …..

Weighing less than 200 grams and compact enough to fit into your pocket, the new range of economic digital hand held refractometers incorporate precise optical picture technology together with automatic temperature compensation, ensuring a greater accuracy than any other portable refractometer in the market.

These simple to use, reliable and affordable instruments are available in a wide choice of single and multi-scale.

Their versatility makes them suitable for the testing of fruit juices, jam, honey, soft drinks, ripeness of fruit, sugar content of beet and cane juices, sauces,
soluble oils, detergents, anti-freeze and
numerous other materials during the production process.

Available Scales  :

  • Brix (% sucrose)
  • Refractive Index
  • Salinity
  • Urine, Protein
  • Alcohol
  • Battery, Antifreeze
  • Propylene Glycol, Ethylene Glycol



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General Purpose Refractometers

Temperature controllable, to both prism and sample cover, by flowing fluid from a thermocirculator temperature range of 5°C~70°C …..

All of this refractometer series feature a small compact design and a robust waterproof construction, with raised display to make cleaning easy and to avoid spillage damage. There are no moving parts to wear out and the LED light source ensures long maintenance free life. The synthetic sapphire prism is virtually impossible to damage.

The GPR series refractometers are supplied complete and ready to use with a temperature controllable hinged sample cover suitable for most types of samples from thin liquids to thick pastes. A selection of alternative sample cells is also available to make these instruments even more versatile. These include a range of volume flow cells and covers for measuring specially prepared solid samples.

Refractive index (RI), Brix (sucrose percent), temperature corrected Brix, temperature corrected RI and up to 10 user calibrated scales are available on all this refractometer series. The instruments can be set to read continuously so that the operator just has to apply a sample to the prism and read or print the result. Alternatively any of these refractometers can be set by the user with a delay time to allow for sample stabilisation. A very useful feature is the operating mode where the refractometer automatically monitors the sample stability and only gives the reading when a stable result has been reached. The user can set the level of stability required to minimise the reading time for the required accuracy.

To comply with the growing requirement for good quality control practice and traceability, the GPR series refractometers all print time and date and optionally a sample number with every reading. The onboard menu provides a feature to disable or enable memory storage of the last 100 measurements that can be viewed for reference or down loaded to a PC or printer. A bar code scanner can be used with the GPR series to further simplify sample identification and recording. Data can be output via the two RS232 outputs. A third input/output socket allows remote operation or provides a pulse to start associated equipment. For security some functions of the keypad can be inhibited to prevent unauthorised use. A security code is then required to re-enable the full keyboard functions.



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High Temperature Refractometers

Electronic heating and cooling automatic refractometer for high temperature applications….


The GPR 12-70E is a general purpose model, specially designed to measure the Refractive Index (RI) or Brix of samples of a wide range of temperatures from about 20°C upwards and is especially suited to high temperature measurements up to 100°C.

Temperature control is by internal solid state Peltier cells and so there is no need for a separate thermocirculator. Even when the sample is 100°C, the sample cover remains cool to the touch. Removing the need for a thermocirculator saves a significant amount of bench space, reduces maintenance problems, provides a safer system as there are no pipes carrying hot fluids and removes the uncertainty in temperature between the external device and the actual sample temperature.

The GPR 12-70E refractometer has Peltier cells located below the prism and also above the sample presser, ensuring all round temperature control. It is essential to control the sample cover as well as the prism to obtain accurate, uniform, sample temperature in the widest range of ambient conditions.


Designed to conform to the strictest requirements of today’s modern analytical laboratory, the GPR 12-70E is ideal for any laboratory that has stringent analysis regulations in place, whether this is in the oil, pharmaceutical, plastics or food industries. The wide temperature range from about 20°C to 100°C and the wide RI range from 1.33 to 1.70, make the GPR 12-70E the best choice for the crude oil and petrochemical industry. It is also ideal for measuring samples such as polymers, jams and preserves, vegetable oils, confectionery boiling, glucose, speciality chemicals etc.


The GPR 12-70E is a versatile and robust instrument appropriate for either the laboratory or factory environment. A small sample volume, about 0.2 to 0.3ml, is all that is required for accurate measurements. The user can select operating modes to suit either their research or their daily quality control analysis routines. The refractometer can be optimised for both clear and turbid samples such as emulsions. Set-up functions can be protected against unauthorised access or interference. Data can be output to a printer and a computer. As well as the reading, the time, date, temperature, instrument serial number and a sample number can all be recorded. “Data Aquisition” software is available from Index Instruments to interface the output data with spreadsheets or text software on your computer to allow you to perform any required calculations and storage of data. The GPR 12-70E also stores up to 100 readings within the instrument, allowing you to scroll back to look at your previous readings, print any of the readings or download to a computer when convenient. A barcode reader is available as an optional accessory to add coded data to the GPR 12-70E output. The instrument can also be integrated into automatic systems.

Reliable and Versatile

The system is fully solid state ensuring excellent reliability and low maintenance. The prism material is synthetic sapphire, almost impossible to damage. If the long life source lamp fails within three years, we will supply a replacement free of charge.

It is simple to switch the displayed reading from refractive index (RI), to Brix (sugar%), temperature corrected Brix or special ‘user’ scales. The operator can enter a temperature coefficient and reference temperature to produce a temperature corrected RI scale or, alternatively, generate a complete calibration, via the keypad, against his own set of standard samples. This high temperature model measures RI by back reflection from the sample, which means coloured, dark and turbid materials can be measured as well as clear samples.
The instrument can also be integrated into automatic systems.