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Yes I recalibrate my refractometer, before the test.My salinity once shot way up. I panicked and took out salt water and replaced with RO to get it back in range. I found out a while later it was actually my refractometer that was off. My mistake caused more stress and damage than it should have. Have you calibrated whatever you are using to check salinity?
Agreeing with posts #25 & #34 about taking sample saltwater to local fish store for second opinion.Yes I recalibrate my refractometer, before the test.

