[airdrie5]

I am having some serious measurement reading issues on my refractometer, hydrometer, GHL Profilux 3.

First I calibrated the refractometer with clean ro/di, freashwater (TDS 134) and set it at zero. I then calibrated my GHL probe with the factory 50mS fluid at 77 degrees. The refractometer now reads at 1.025 and the hydrometer and GHL probe are both reading at 1.0213.

I have done this over and over numerous times hoping for a different outcome but each time the same results.

I also have a pinpoint salinity probe at it as well (when calibrated with the factory 53.0mS) it too reads completely different than any of the other measurement tools.

Hoping to get some reef guru's to help me out here.

Thank you all in advance.