How to Use a Refractometer to Measure Specific Gravity

A refractometer instantly reads gravity of unfermented wort, wine must, mead or fruit juice by measuring the degree that light passing through the sample is bent. Unlike a hydrometer, only a few drops are required for a sample. To use, apply 2-3 drops to the prism face, close cover, and look through the eyepiece while aiming your refractometer at a light source.

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