Hanna Instruments

HI98319 Marine Salinity Tester

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Designed for Simple Aquarium Salinity Testing

Hanna Instruments HI98319 Marine Salinity Tester measures electrical conductivity (EC) to determine the salinity of natural and artificial seawater. Within seconds, the salinity and temperature are measured, and then using the temperature reading, automatically compensated and displayed on the easy to read LCD screen. Ensuring the proper salinity in your reef tank allows your fish and corals more time to grow instead of having to adjust to constant salinity changes. If you have a hard time seeing the fuzzy blue line common with traditional refractometers, or just want to make your life easier, pick up a Hanna HI98319 Salinity Testing Pen!

  • Comes with calibration solutions ensuring proper readings
  • Ideal for testing salinity in any aquariums
  • Pocket-sized for easy travel
  • Graphite sensors reduce polarization effects
  • Fast and accurate temperature readings
  • Selectable auto-off prolongs battery life 


Easily cycle between the three common salinity measurements:

  • ppt - parts per thousand
  • PSU - practical salinity units
  • S.G. - specific gravity 



  • 0.0 to 70.0 ppt (g/L)
  • 0.0 to 70.0 PSU
  • 1.000 to 1.041 S.G.


  • 0.1 ppt (g/L)
  • 0.1 PSU
  • 0.001

Accuracy (@25ºC/77ºF)

  • ±1 ppt for 0.0 to 40.0 ppt (±2 ppt for readings over 40.0 ppt)
  • ±1 PSU for 0.0 to 40.0 PSU (±2 PSU for readings over 40.0 PSU)
  • ±0.001 S.G.


Temperature Range - 0.0 to 50.0°C (32.0 to 122.0°F)

Temperature Resolution - 0.1°C (0.1°F)

Temperature Accuracy (@ 25°C/77°F) - ±0.5°C; 1°F

SalinityCalibration - Automatic single point 35.00 ppt

Temperature Compensation - Automatic from 5 to 50.0 ºC

Battery Life - Approximately 100 hours of continuous use

Environment - 0 to 50 °C (32 °C to 122 °F) RH max 100%


What's Included?

1x HI98319 Marine Salinity Tester

1x CR2032 Battery (installed)

1x Storage Case

4x 35ppt Calibration Standard Sachets

1x Instruction Manual

1x Quality Certificate

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Product Questions

How often should it be calibrated?
Question by: Tyrone on Mar 27, 2024, 7:04 PM
Hi there, thanks for the question! It should be calibrated monthly or more frequently if used often, per Hanna.
Answer by: Grace (BRS Staff) on Apr 4, 2024, 3:36 PM
What kind of replacement battery does this take?
Question by: Joseph Olson on Feb 25, 2024, 12:28 PM
Hey there,
Thank you for reaching out to us. This unit uses a common CR2032. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Feb 26, 2024, 10:36 AM
Is this tester accurate enough to test my salt water swimming pool which should be at 3000 PPM?
Question by: George on May 31, 2019, 4:40 PM
Hey there,
Thanks for reaching out to us. It would accurately measure from 0-70 ppt (70,000 ppm) and please let us know if you have any further questions. Take care!
Answer by: Mark Schlough on Jun 3, 2019, 11:18 AM