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Andy Lopez, Contributing Columnist/Invisible Gardener
9:11 am PST February 16, 2017

Relative density scale indicates the percent of sucrose by weight (grams per 100 milliliters of water) in a solution or juice of a plant measured in degrees Brix. 

A refractometer is used for measuring solids dissolved in water; it corresponds directly to the refractive index scale. A refractometer allows you to accurately measure the percentage of sugar or Brix in any liquid with just two or three drops.