I have 5 older coralife hydrometers lying around. Two deep six as pictured, and 3 older models. One day I decided to test them all along with my vertex refractometer... Every single one was at least .002 difference! Not any one of them was at the same specific gravity.
They are truely inferior products. I would never buy one after using a refractometer. I can only imagine my salinity swings in some of my older tanks during water changes. Must have been terrible.
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They call it addiction for a reason...
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