Handheld Salinity Refractometer

The STX-3 Handheld Salinity Refractometer features the largest, easiest-to-read scale available with clear, sharp figures, screen shading and incredible contrast. This significantly enhances overall precision, even when several different people use the refractometer. The STX-3 also comes with a rubber grip on the body, which blocks the transmission of hand heat to eliminate temperature errors.

With an automatic temperature range of 10 to 30°C, the STX-3 can be used in outdoor environments without the need to re-zero. All measurements are automatically compensated to 20°C. If measurement values shift, zeroing the STX-3 is very simple. The patented "Zero Ring" eliminates the hassle of using a separate tool during zero calibration. Simply place a few drops of distilled water on the prism and turn the "Zero Ring" until the scale is zeroed and secure the setscrew...that's it!

The rugged construction of the STX-3 will provide years of reliable use. The optical glass prism is mounted in an all-metal housing which allows the sample and prism to reach temperature equilibrium quickly. The non-roll stand ensures that once the STX-3 is placed on a table or bench top, it won't be prone to roll off the surface.

Each order comes with a 5-year warranty & includes a zippered vinyl carrying case, plastic transfer Pipette, and instruction manual. 

                                                                                                                                      Key Features & Benefits

  • Large, Sharp Display Scales with high contrast
  • High-quality optical glass material for consistent, accurate readings
  • Durable, industrial-grade design with non-roll stand feature to keep unit secure on flat surfaces
  • Tactical, non-slip Rubber Grip on body to block transmission of hand heat reducing temperature effects
  • Prism encased in all-metal housing allowing sample and prism to reach temperature equilibrium quickly
  • Maximum sample temperature: 90°C (194°F)
  • Five-Year Warranty

                                                                                                                     Specifications Chart

Scale 1 Type Salinity
Scale 1 Range 0 to 100%
Scale 1 Resolution 1%
Scale 1 Accuracy ±1%
Scale 2 Type Specific Gravity
Scale 2 Range 1.000 to 1.070
Scale 2 Resolution 0.001
Scale 2 Accuracy ±0.001
Temperature Compensation 10 to 30°C
Dimensions 7.28 x 1.57 x 1.57 in. (185 x 40 x 40 mm) 
Weight 0.63 lbs.


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Customer Reviews

Based on 3 reviews
Used many different brands, this is best!

I have been using Refractometer devices for decades of different brands. This is the easiest to read of any I've used.

Worth the price

Heavy well built with glass optics. Other cheap refractometers are not nearly as durable. Overall, totally worth the extra cash for this high-quality refractometer.

Excellent Refractometer!

Significant quality difference between this refractometer and the cheap alternatives out there. Definitely worth it!