I have an ATC Refractometer, and for the past decade have been guilty of calibrating it with clean RO/DI at 0. Never spent much time on reef forums until now. It's obvious now that isn't the best way, I now have a calibration fluid for 1.026, and calibrated it on that. I would have assumed even after calibrating at 1.026 and then checking the RO/DI water that it would have been at least somewhat close to 0, but it is quite a bit off at around .005 below 1.000. Is this typical? Or is something wrong here.
Apparently I have been reefing for 10 years at 1.022 now that i have it calibrated with a calibration fluid instead of using 0...
Apparently I have been reefing for 10 years at 1.022 now that i have it calibrated with a calibration fluid instead of using 0...