Hi Randy,
I consider myself an advanced aquarist but I'm just stumped by 35 PPT calibration fluid. I have three bottles of calibration fluid, two of them brand new, one- brightwell aquatics the other Aquacraft. The third is roughly half empty after using it for a couple months, it's Aquacraft brand.
Aqua Craft Standard Seawater 35 ppt Refractometer Calibration Solution - 60 ml
Brightwell Aquatics Refractometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density
I'm seeing a delta of 4 PPT between the two new bottles, aqua craft vs. brightwell solutions. Same refractometer. solutions and refractometer kept in the same room so they are at equal ambient temp. I'm doing multiple tests and carefully drying off the refractometer after each test. the deviation is consistent after 3-4 tests with each solution
comparing the new aquacraft to the old aquacraft bottle. I see a 1 PPT deviation, I suspect that's because of some degradation from this bottle being used over a couple of months. Might have left the cap off one or twice.
but I'm just stumped as to why I'm seeing such a significant difference between the two new bottles.
finally, am I overthinking this to much, I know I shouldn't chase numbers but I think it's important to stay consistent at 35 PPT so I'm concerned with the variation I'm seeing between calibration solutions.
what do you consider the gold standard for refractometer calibration solution?
appreciate your help and knowledge as always!
Thank you,
Beachsidereefer
I consider myself an advanced aquarist but I'm just stumped by 35 PPT calibration fluid. I have three bottles of calibration fluid, two of them brand new, one- brightwell aquatics the other Aquacraft. The third is roughly half empty after using it for a couple months, it's Aquacraft brand.
Aqua Craft Standard Seawater 35 ppt Refractometer Calibration Solution - 60 ml
Brightwell Aquatics Refractometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density
I'm seeing a delta of 4 PPT between the two new bottles, aqua craft vs. brightwell solutions. Same refractometer. solutions and refractometer kept in the same room so they are at equal ambient temp. I'm doing multiple tests and carefully drying off the refractometer after each test. the deviation is consistent after 3-4 tests with each solution
comparing the new aquacraft to the old aquacraft bottle. I see a 1 PPT deviation, I suspect that's because of some degradation from this bottle being used over a couple of months. Might have left the cap off one or twice.
but I'm just stumped as to why I'm seeing such a significant difference between the two new bottles.
finally, am I overthinking this to much, I know I shouldn't chase numbers but I think it's important to stay consistent at 35 PPT so I'm concerned with the variation I'm seeing between calibration solutions.
what do you consider the gold standard for refractometer calibration solution?
appreciate your help and knowledge as always!
Thank you,
Beachsidereefer