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- Jun 28, 2020
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Like someone else suggested; use a calibration solution to verify your test.Well, took some water to a really lfs (the other one was 30 miles away) with my refractor and his read it high too...while mine read it normal. So now I know the probable cause of the coral...salinity was way too high. I have already did one water exchange and bought a digital tester. I'll return this bad one and get another one too as backup.