Hanna Salinity Tester


HI-98319 Waterproof Salinity Tester.

This pocket sized meter is waterproof and perfect for measuring the salinity of aquarium water.

Out of stock


Hanna Instrument’s HI-98319 waterproof salinity tester is ideal for any saltwater aquarium. It is handy for checking the aquarium temperature too. It is quick and easy to use. The Hanna Salinity Tester shows a digital readout of both salinity and temperature on its screen. Salinity results are displayed in either parts per thousand (ppt), Practical Salinity Units (PSU), or Specific Gravity (SG).

This is a more accurate alternative to refractometers. This salinity meter uses conductivity to determine salinity levels. It works on both natural and artificial seawater.

Another bonus is that you don’t have to recalibrate it every time you use it. Once a month should be sufficient for normal usage. The meter comes with a few calibration sachets to get you started. When you need more, we have the correct 35.00 ppt calibration sachets in stock too.

Salinity should be checked regularly in aquariums. As Oceans are very stable environments, where there is not a lot of day to day change in the water parameters, fish can respond negatively to even small changes in salinity.

Click here to see Vanessa’s review

Top tip:

Make sure that you top up for evaporation with RODI water regularly. Better still get an automatic top up system to do it for you! This will keep your salinity more stable.

What is the best salinity for my tank?

The ideal salinity for your aquarium will depend on what type of saltwater set up you have. Red Sea recommend between 33 – 35 PPT.

In case you are more used to using SG (specific gravity) to measure your salinity – this converts roughly to between 1.024 – 1.025 depending on the temperature of your aquarium (see chart below).

Celsius 1.024 1.025
24.4 33.7 35
25.0 33.9 35.2
25.6 34.1 35.4
26.1 34.3 35.6
Conversion table for salinity in parts per thousand (ppt) to specific gravity (sg) combined with temperature variation.
Approximate salinity, in parts per thousand, for the hydrometer reading at the indicated temperature.

Each Hanna Salinity Tester is supplied with:

  • CR2032 battery (installed)
  • Storage/protection shield
  • Instruction manual
  • Quality certificate
  • 35.00 ppt calibration standard sachet (x 4)

To obtain the highest accuracy for measurements, it is important to follow these guidelines:

  • Calibration is only as good as the solution being used. Fresh solution should be used for each calibration
  • The probe should be rinsed with purified water each time before placing in calibration solution or sample to be tested
  • Recommended solution: HI-70024P Calibration Solution 35.00ppt, 20ml sachets

The meter features a low battery indicator. When the battery is running low, the battery indicator will blink on the LCD. Simply change the CR2032 Li-ion battery by removing the battery cover located on the back of the meter.

ppt 0.0 to 70.0 ppt (g/L)
PSU 0.0 to 70.0 PSU
S.G. 0.001-1.041
Temperature 0.0 to 50.0 °C/32.0 to 122.0°F
ppt 0.1 ppt (g/L)
S.G. 0.001
Temperature 0.1 °C/1 °F
ppt ±1.0 ppt for 0.0 to 40.0 ppt; ±2.0 ppt for 40.0 to 70.0 ppt
PSU ±1.0 PSU for 0.0 to 40.0 PSU; ±2.0 PSU for 40.0 to 70.0 PSU
S.G. ±0.001
Temperature ±0.5 °C (±1.0 °F)
ppt International Oceanographic Tables, 1966
PSU Standard Methods for the Examination of Water and Wastewater, 2520 B, Electrical Conductivity Method
S.G. Standard Methods for the Examination of Water and Wastewater, 2520 C, Density Method
Calibration Solution HI-70024 (35.00 ppt)
Calibration Automatic, single point 35.00 ppt
Temperature Compensation Automatic from 5 to 50.0 °C
Environment 0 to 50°C; RH max 100%
Battery Type CR2032 3V Li-ion (1)
Battery Life Approximately 100 hours of continuous use
Weight 68g without battery


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