Well if you're using a calibration solution for a digital meter anyway then you can certainly do the same for a refractometer. No matter what kind of refractometer you have if you calibrate with a NSW solution at the same range you keep your tank then you will have no accuracy issues and you don't have to calibrate it every time you use it. You really can't say this digital meter will be more accurate, that's just not accurate information and unethical marketing. All you can say is that rather having to read a gauge you get a digital read out which to me seems hardly worth while as refractometers are very easy to read.
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