Anyone have refractometer calibration fluid?

One of the advantages of having access to a lab is the ability to make your own calibration fluid. I made some yesterday (using the article listed above) and calibrated the refractometer last night. I was off by 0.002. What I thought was 1.025 specific gravity ended up being 1.023. I am going to try to raise it to 1.025 over the next few weeks.
 
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