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You should get a 50ms or 53ms solution and calibrate your probe with it.
Be aware to chose the Temp probe for the temperature compensation on the calibration process if you are using the one from profilux.
Make sure also to set the right solution temp on the calibration process.
Once the calibration done you should get 50ms and then on your tank water arround 53ms if you are aiming 35ppt
Concerning the units better to set it as PSU which is the same as PPT unit
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