This product showed us that our traditional floating needle salinity tester that we have been using for decades is obsolete! He read that our salinity was 1.022, the refractometer showed our aquarium was 1.028! We couldn't believe it so we took the refractometer to our local fish shop to make sure we were using it correctly and that it was properly calibrated. To our shock and surprise, this is true, and our fish live in higher salinity than we thought.
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