Salinity Calibration?

A precision floating hydrometer in tank or fresh made saltwater. Then use a precision thermometer to adjust for temperature, setting conductivity meter and refractometer to the same reading.
 
BRS sells the Aquacraft brand calibration fluid. I like Aquacraft because it has a built in dropper. There is no issue with diluted fluid from when you use a manual dropper if used after rinsing with RO water, or dried salt in the manual dropper.
 
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