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50ms = 32.738ppt = 1.0247sg = 1.0247kg/l

Conversion done here: https://www.hamzasreef.com/Contents/Calculators/SalinityConversion.php

Please check the refractometer and the conductivity sensor with the 50ms fluid. Then you can see which one shows a wrong value and recalibrate.
If you want to adjust the reading you can do that in...