Brightwell Aquatics Refractometer Calibration Standard 60 ml

Recommend!

I advise everyone to be very careful using this brands solution for calibration. I took this liquids reading as good becuase everything else from this company is good. Well that was a massive mistake, it told me my water salinity was extremely low, so I added salt over a couple days to raise it to what is supposed to be 35ppt according to the solution. Well my black storm clownfish are no longer white and black, they are now pink and black(no more white). My anemones are extremely stressed and elongated, one has been losing tentacles over the last week. My turbo snails have died, and all of my coral (hundreds worth) except for one has completely died :( I couldn't figure out what was going on. Today I decided to buy a bounce mushroom from a local guy I know. Well I decided to test his salinity before adding them to the tank and it showed super low on my refractometer. I called him and he checked his water with his Milwaukee tester and it shows as a perfect 1.026. So I calibrated my refractometer to his water. The Brightwell Aqautics solution tested at 43PPT!! That means my water has been at 43PPT for the last week and some change, I feel sick about this and can only imagine how my tank inhabitants feel.

I just got this to double check that my refractometer was calibrated correctly. I had another brand of calibration fluid and wanted to make sure it was still good. This fluid confirmed exactly the same as the other one. And a better price than the others.

This is a life saver - literally. I ordered a new refractor and without this could have killed everything by drastically changing the salt % in my reef tank .

Calibrated my meter with it made a minor adjustment and then checked with distilled water and was spot on.

The solution arrived yesterday. Calibrated my refractometer using it. My tank water read as less than 30ppt. Brought the solution to my local aquarium, shockingly, the saltinity is 41 ppt! Went to another store, the reading is over 42 ppt. It's a horrible experience. The bottle came perfectly sealed with no leak. What kind of quality control this company has? Imagine if I follow the reading of this solution, it will severely damage the entire tank. Imagine if it's not off by that much, I would have trusted the solution. Then my livestock will be living in a condition two or three ppt higher than 35.

It does the job well, reading the right SG works on my refractometer. I only wonder how accurate the drops are when putting them on the glass, I would have liked to use a syringe for the exact amount of fluid.

Measured as expected.

works as needed.

Incredibly useful and repeatedly used to re calibrate my refractometer for my marine tank. Most hobbyists suggest using RO for calibration which is nonsense and doesn’t work! Shake well each time before use 👍

Does what it says.

Does exactly what it says it does Good buy and lasts a very long time

I wanted to give it 0 stars …Do not buy. Highly inaccurate solution / reading. As others have stated. Stay away !!!