This is a system just like J257 but without the top cover. Model J257 has a range between 1.26 to 1.72RI and 0 - 100Brix. The accuracy is +/- 0.0001RI / +/-0.1Brix. The resolution is 0.0001RI and 0.01Brix. The temperature control of the sample can be done in either 20 deg C or 25 deg C. This would satisfy both USP and EP needs. The communication interface is through 2 RS232, one parallel printer port and one auxiliary port.

The same system can also be configured for the reading of Butyro scale. The Butyro has to be analysed in 40 deg C and the J57WR can be set for 20 deg C & 40 deg C. This would allow this system to be used in any food company where the analysis would either be for Sucrose or for Butyro.


The J57WR Automatic Refractometer was designed to meet the unique needs of industrial environments in the chemical industry where the refractometer is viewed as a QC tool rather than a laboratory instrument. A single flat measurement surface, electronic temperature control and one button measurement capability make it perfect for heavy use applications.

Automatic Measuring System

The Rudolph J57WR features a fully automatic measuring system. The operator simply places the sample on the prism, presses a button and the result is displayed on a 7.5cm x 10cm back lit LCD. There are no shadow lines to match and there is no eyepiece requiring operator determination or manual adjustment.

Electronic Temperature Control

Refractive Index (BRIX) readings are very sensitive to temperature. When measuring sucrose users have the option of correcting for temperature variation but that option does not work for most chemical companies. Users not measuring sucrose or users looking for better accuracy than provided by temperature correction had to spend the extra money for a circulating water bath and then clean and maintain it. The J57WR’s built in electronic temperature control provides the best of both worlds, the absolute accuracy, regardless of sample type, of a temperature controlled instrument with the convenience of operating without a water bath.

Wide Measuring Range

The J57WR was designed for chemical measurement, not food. This means a very wide measurement range from 1.26 - 1.70 enabling the instrument to measure materials like fluorocarbons and aromatic chemicals that are beyond the range of most refractometers.

Easy to Clean Measurement Surface

Regardless of the specified instrument accuracy the real world performance will always depend on how well the instrument is cleaned between samples. The J57WR addresses this issue by providing a very flat easy to clean measurement surface with no corners or crevices that tend to trap samples in instruments designed for laboratory use.


High Durability Sapphire Prism

When a traditional refractometer is used in a high throughput application, prism replacement becomes a regular task. Traditional Abbe refractometers have glass prisms which are much softer than the sapphire prism of the J Series and thus more prone to scratching and general wear and tear.

Lowest Whole of Life Cost

Users in high throughput chemical applications have traditionally used Abbe refractometers due to their low purchase price. Changes in relative prices between refractometers and optics and the elimination of a water bath mean the J57WR now has a much lower whole of life cost than an Abbe refractometer.


The J57WR Automatic Refractometer offers 1 or 2 point calibration. The instrument stores the date and the time of the last calibration in line with ISO and similar standards. Regardless of how many times the refractometer is calibrated it can always be restored to the default factory calibration.

User Configurable

j57wr measurements

Versatile instruments have advantages when applications change however this versatility can also lead to confusion with extra buttons and by forcing operators to interpret extra results that have no relevance. The J Series customizable display allows the instrument to be configured to exactly what is required for each application. The customizable keypad can be "locked out" or just a few keys can be operable, i.e. the measure key, print key, zero key, customer specified sample keys or any combination thereof. The lockout function, calibration and other functions are all password protected.

j57 03

Touchscreen and LCD

All functions of the J57WR Automatic Refractometer are activated through a large touch screen LCD. The 70mm X 75mm measure button on the J57WR is designed to allow an operator wearing gloves to activate measurement with an elbow or side of a hand. The sealed touch screen is resistant to fingernails, sharp objects, chemicals and acids.

Password Protection

A combination of password protection and being able to lock out specific "keys" enables control over which users can access certain functions. This means that the J57WR can be set up as a one-button instrument for factory environments.

Printer & Computer Output

In today's highly regulated environment many users find hard copy or computer record keeping essential. The J57WR comes complete with a standard centronics port for a printer and an RS232 port for direct computer connection.


J57WR Refractometer Specifications

Measurement Scales Refractive Index (RI)
BRIX (% sucrose)
Measurement Range 1.26 - 1.70 RI,
0 - 95 BRIX
Resolution 0.00001 RI
0.01 BRIX
Reproducibility ±0.0001 RI,
±0.1 BRIX
Accuracy ±0.0001 RI,
±0.1 BRIX
Wavelength 589.3nm
Prism Artificial Sapphire
Light Source Light Emitting Diode (est. life: > 1,000,000 measurements)
Response Time Continuous readout or user programmable delay (i.e. a 25°C sample can be cooled to 20°C and measured in 20 seconds)
Communication Interface Two RS232 ports
One parallel printer port
USB adaptor available
Control Temperature 20°C and 25°C
Temp. Accuracy ±0.05°C
Ambient Temp. Limit 10°C - 40°C
Temp. Correction Range 18°C - 95°C (for pure sucrose solutions)
Temp. Measurement & Control Prism surface
Calibration 1, 2 or 10 point
Operating Dimensions L: 16"  W: 14"  H: 6"  / 13.6 lbs.
Shipping Dimensions L: 26"/  40cm; W: 21"/  54cm; H: 16"  40cm / 30 lbs.
Power Requirements 100 - 240 volts, 50 Hz - 60 Hz
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