HI-98319 Waterproof Salinity Tester


Our new HI-98319 waterproof salinity and temperature tester is perfect for any saltwater aquarium. A more accurate alternative to refractometers, this tester uses conductivity to determine salinity levels of natural and artificial seawater. Ideal for testing salinity in salt water aquariums, it is quick and easy to use and provides digital readout of both salinity and temperature.

Salinity results are displayed in either parts per thousand (ppt), Practical Salinity Units (PSU), or Specific Gravity (SG).

Our marine salinity tester is supplied complete with batteries and solutions allowing you to start measuring right away. Also displays temperature.


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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) 

PSU: 0.1 PSU 

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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