Brightwell Aquatics Refractometer Calibration Standard, Accurate Reference for The Calibration of Seawater Refractometers, Hydrometers & Other Density Measuring Equipment, RES60

Advertised as 35 PPT and it was spy on, verified against 4 refractometers and 3 electronic readers. Brighter ll is always as advertised, unlike a few competitors that can be all over the map

Recommend!

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 .

Took weeks to arrive and when it finally did it was leaking in the sealed bag it arrived in. Amazon was quick to refund me without having to return. Thank you Amazon. There was a usable amount left in the bottle so I wanted to try it out. I had calibrated using distilled water before but wanted to make sure my tool was accurate so I bought this. Half cup sea salt to one cup of water normally gets me pretty close to 35 parts per thousand and that's what my refractive meter shows after being calibrated with distilled. This stuff is reading 76 or 77 parts for thousand salinity so it's dangerously and comically incorrect. All I can say is wow. If this is what I use to calibrate my tool in the beginning I would have been in a world of hurt. Luckily it's so far off that it wouldn't have gone unnoticed.

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.

I used this product and it proved the solution I had for years had gone bad. My old solution was off by .004. Despite properly shaking both old and new solutions the refractometer was off by a specific gravity of .004. I read 1.021 on my old solution and 1.025 with my new solution. This product states to replace your solution after time. They are right to recommend this. Also, for newbies...remember the 35 ppt Salinity = 1.0264 on your specific gravity. The left side of you refractometer is for specific gravity, the right side is the reading you set to 35 after 45 seconds. Instructions Shake product well before using. Clean Refractometer prism slide with fresh distilled water. Dry completely with soft clean dry cloth. Place several drops of Brightwell Refractometer Calibration Standard fluid on the slide. Wait 45 seconds and calibrate to 35 ppt Salinity.

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

I got this when I ordered my refractometer. The fluid is set to a specific salinity (not 0, its 1.0264) that allows to to calibrate your refractometer. Worth it to ensure accuracy.

works as needed.

Do not buy! I brought this refractometer calibration solution, it is supposed to calibrate it to 35 salinity / 1.026 and after testing it on 2 different refractometers and comparing it to saltwater from 2 different local fish shops it is not accurate and nearly crashed my fish tanks salinity levels (£1000s of pounds of corals and fish). As you can see from the reviews others have said the same.

Nearly crashed my tank! For several weeks had wrong salinity of the water! Reading difference 5ppt! Stay away from this product!

Does what it says.

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