I ran into the same problem. I set up my profilux and after calibrating the probe I was reading 1.019. Checked my cal on the refrac with pure water and it said I was right. Re-calibrated the probe and it was the same. Very frustrating. I get out a floating hydrometer and 4 swing arm hydrometers. I have never trusted swing arm hydrometers but all four read closer to what my profilux was reading than the refrac. The floating was the exactly the same as my profilux. I recalibrated the profilux probe about 20 times and it never changed. Still not being the trusting type I have only brought my salinity up to 1.024. I will get some fresh cal fluid and re-test some more and then bring it up to what I thought I had been running all this time..... 1.025
Scott
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