Caution for anyone using a refractometer

[Reefer Rob]

The problem is that a lot of the refractometers that find their way into the aquarium industry are for measuring brine, as in for the pickling industry. Our salt water has a lot of other major elements that also effect the refractive index of the water.

According to Pinpoint, their calibration fluid also works well to calibrate our refractometers.

Here's the original thread that spawned Randy's article.