I can’t keep that thing calibrated for more than a week to save my life. I still use it to ensure my slat mix is the same as the tank when doing water changes but I don’t trust it anymore to figure out what the salinity actually is. Still using the same 6 yr old hydrometer with no issues… I’m all about the hanna checkers but this salinity meter is crap imo. That being said almost everyone else disagrees with me so what do I know
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