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The system I tested read 0.09ppm copper (Hanna checker with gloves and cleaned with microfiber towel). The margin of error is +/- 0.05ppm
That is an unreliable test that can safely be ignored. It is not nearly as accurate as that uncertainty claims.
Many folks see elevated levels with it (most, I think, since so many are suddenly reporting these "levels") and when tested by ICP that is way more sensitive: none or tiny amounts.
The tank does have an icp test being processed at the moment so that is good. Is the hanna checker too unreliable for something such as copper in a quarantine tank?
The tank does have an icp test being processed at the moment so that is good. Is the hanna checker too unreliable for something such as copper in a quarantine tank?