Total Dissolved Solids (TDS) is a measurement unit. The number gives us a certain idea about the strength of a →coffee. For measuring the TDS from a cup of coffee you need a refractometer. This important tool points a monochrome light through the coffee probe. The deviation of light is calculated to a TDS unit. Usually in the range of 1,00–1,50 for coffee and 7,00–12,00 for espresso. For further use you need a brewing control chart or an app to calculate →extraction and →flowrate.
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