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I guess if that's what the manufacturer says to do, that's what you should do, but even way back through high school and college chemistry classes I was always taught to calibrate instruments within the range of expected results. This is why calibration solution is 35ppt, and not 0.
You can certainly check using a 35ppt solution- I have that as well.
But refraction is pretty simple. Once you have a “zero” point, it’s a simple calculation from there.