Refractometer for Seawater Measurements

Refractometer For Seawater Measurements is a rugged portable, water resistant device that utilizes the measurement of the refractive index to determine the salinity of natural and artificial seawater, ocean water or brackish intermediates.

The HI 96822 benefits from Hanna?s years of experience as a manufacturer of analytical instruments. This digital refractometer eliminates the uncertainty associated with mechanical refractometers and is rugged and portable enough to be used at home, in the lab and out in the field.

The HI 96822 is an optical device that is quick and easy to use. After a simple user calibration with distilled or deionized water, a seawater sample can be introduced into the sample well.

Within seconds, the refractive index and temperature are measured and converted into one of 3 popular measurement units: Practical Salinity Units (PSU), Salinity in parts per thousand (ppt), or Specific Gravity (S.G. (20/20)). All conversion algorithms are based upon respected scientific publications using the physical properties of seawater (not sodium chloride).

Temperature (in °C or °F) is displayed simultaneously with the measurement on the large dual level display along with icons for Low Power and other helpful message codes.

Order Information:

  • Supplied with battery and instruction manual.


Range (PSU) 0 to 50
Range (Ppt) 0 to 150
Range {Specific Gravity (20/20)} 1.000 to 1.114
Range (Temp) 0° to 80° C (32° to 176° F)
Resolution (PSU) 1
Resolution (Ppt) 1
Resolution {Specific Gravity (20/20)} 0.001
Resolution (Temp) ±0.1° C (0.1° F)
Accuracy (@20° C) (PSU) ±2
Accuracy (@20° C) (Ppt) ±2
Accuracy (@20° C) {Specific Gravity (20/20)} ±0.002
Accuracy (@20° C) (Temp) ±0.3° C (0.5° F)
Temperature Compensation Automatic between 10° and 40° C (50° to 104° F)
Measurement Time Approximately 1.5 seconds
Minimum Sample Volume 100 L (to cover prism totally)
Light Source Yellow LED
Sample Cell Stainless steel ring and flint glass prism
Auto-off After 3 minutes of non-use
Enclosure Rating IP 65
Battery Type/Battery Life 9 V/Approx 5000 readings
Dimensions/Weight 192 x 102 x 67 mm (7.6 x 4 x 2.6)/420 g