The article describes how to make your own solution. I did so quite a while ago and was pleased to find that my refractometer was dead on at 1.026. I had also initially calibrated it with RO water. I imagine there can be some variation in manufacturing tolerances with these low cost units which would necessitate calibrating it to the desired reading instead of to 1.000. I'm sure if you've sprung for a high end lab grade unit, this would be less of an issue.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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