Refractometer Calibration Clarification

[Randy Holmes-Farley Verified Community Expert]

True, but we only mix once. Once you mix sodium chloride with water, there's no need to mix again, so I have no idea what these people/companies are making?

Miami Reef pointed out last time I was whining about the shake directions, that if there is condensation on the inside of the lid, that might be a reason to mix, but I agree with the idea expressed here that it was more likely an idea from someone who doesn’t really understand what it means to be a solution that should never need any mixing.