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The first thing to note is that your refractometer and your hydrometer are measuring different physical attributes of your wort. You need to account for these differences, and additional errors. Refractometers The refractometer is primarily measuring sugar content, through the difference in refraction relative to pure water. This is where calibration comes ...


First, refractometers vary, their quality is different from model to model. Temperature range they can work properly is pretty wide, but it's there. Make sure you are not outside it. Second, with your refractometer you should get manual and calibrating solution. Be sure to use these, without proper calibration readings will be off. Third, of course ...

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