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Coffee refractometers fall into two main measurement approaches: TDS (Total Dissolved Solids) refractometers – purpose-built for coffee extraction analysis. % Brix refractometers – originally designed for sugar concentration but sometimes used for coffee with conversion formulas. Below is a clear comparison plus some of the best instruments in each category. TDS vs % Brix Coffee Refractometers Feature TDS Refractometer % Brix Refractometer What it measures Total dissolved solids from coffee extraction Sugar concentration (sucrose standard) Designed for coffee? Yes No (but usable with conversion) Accuracy for coffee High Moderate Typical coffee range ~0–20% TDS ~0–32° Brix Data use Extraction yield...