Salinity Measurement discrepancy

[weiss]

I recently tested my Tank salinity with a refractometer(calibrated prior to measurement) and got a reeding of 0.015 difference.I then calibrated the salinity probe and the reading remained the same.I then used 2 different makes of Hydrometers to retest the salinity and they gave me the same reading as the refractometer.What could cause this?I have subsequently lowered my tank salinity to reflect 1.0245 mS on profilux which measures 1.0260.(0.015 difference).

 

[Matthias Gross]

we discussed this topic several times, please use the search function

Quick help: use the offset function for correction