What is the primary use of a refractometer in coffee brewing?

The primary use of a refractometer in coffee brewing is to measure the concentration of dissolved solids in the brewed coffee. This device utilizes the principle of light refraction to determine how much coffee solubles are present in the liquid. The refractometer provides valuable quantitative data that helps baristas and coffee professionals analyze and optimize the extraction process.

By measuring the concentration of dissolved solids, users can assess how well coffee is being extracted during brewing. This helps in determining variables such as grind size, brew time, and water temperature, leading to a more consistent and desirable cup of coffee. Understanding the concentration of dissolved solids aids in reaching the ideal balance of flavors and strengths, creating a framework for improving brewing techniques.

Other choices address different aspects of coffee preparation but do not align with the refractometer's specific application in measuring solutions. While examining grind size or improving water quality are important for overall brewing outcomes, they are not the primary functions associated with the use of a refractometer. Evaluating flavor profiles, though essential for tasting and assessing coffee, is a subjective process that does not rely on the refractometer's quantifiable measurements.