Digital Refractometer for Seawater Analysis – HI96822

The HI96822 is a rugged, portable digital refractometer designed for the measurement of salinity of natural or artificial seawater. The HI96822 displays results in three popular measurement units: Practical Salinity Units (PSU), salinity in parts per thousands (ppt) and specific gravity (S.G. (20/20)). The instrument’s high accuracy and simple operation gives reliable results each and every time. All readings are automatically compensated for temperature variations and displayed within a 1.5 second response time. The sealed flint glass prism and stainless steel well are easy to clean. Just wipe with a soft cloth in preparation for the next sample.


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The HI96822 Digital Refractometer eliminates the uncertainty associated with mechanical refractometers by measuring the refractive index to determine the salinity of natural and artificial seawater including brackish, ocean water or saltwater aquarium. The instrument converts the refractive index of a sample to PSU, ppt and specific gravity. These conversions are based on respected scientific publications using the physical properties of seawater (not sodium chloride). The HI96822 is an easy to use tool for measuring salinity in natural and artificial seawater whether in the field, lab or at home.


Features at-a-glance:

  • One-point calibration with distilled or deionized water
  • Small sample size, can be as small as 2 metric drops (100 μl)
  • Automatic Temperature Compensation (ATC)
  • Quick, results in approximately 1.5 seconds
  • Dual-level LCD displays measurement and temperature readings simultaneously
  • Easy to clean and corrosion-resistant stainless steel sample well
  • Battery indicators percent level remaining at startup and low battery indicator
  • Automatic shut-off to conserve battery life
  • IP65 water-resistant protection & ABS plastic casing designed to perform under laboratory and field conditions.


Salinity, Seawater

Salinity (PSU) Range0 to 50 PSU
Salinity (PSU) Resolution1 PSU
Salinity (PSU) Accuracy±2 PSU
Salinity (g/L) Range0 to 150 ppt
Salinity (g/L) Resolution1 ppt
Salinity (g/L) Accuracy±2 ppt
Specific Gravity Range1.000 to 1.114 Specific Gravity (20/20)
Specific Gravity Resolution0.001 Specific Gravity (20/20)
Specific Gravity Accuracy±0.002 Specific Gravity (20/20)


Meter Temperature

Temperature Range0 to 80°C (32 to 176°F)
Temperature Resolution0.1°C (0.1°F)
Temperature Accuracy±0.3 °C (±0.5 °F)
Temperature Compensationautomatic between 0 and 40°C (32 to 104°F)


General Meter

Automatic Shut-Offafter three minutes of inactivity
Battery Type/Life9V / approximately 5000 readings
Dimensions192 x 102 x 67 mm (7.6 x 4.01 x 2.6”)
Weight420 g (14.8 oz.)
Refractometer Light Sourceyellow LED
Minimum Sample Volume100 μL (to cover prism totally)
Sample Cellstainless steel ring and flint glass prism
Measurement Timeapproximately 1.5 seconds
Ordering InformationHI96822 is supplied with battery and instruction manual
NotesEnclosure Rating: IP65

Additional information

Weight.7 kg
Dimensions25 × 13 × 13 cm


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