Estimating TDS from Refractive Index

We often use refractometers to measure total dissolved solids (TDS) of coffee, but these instruments don’t measure TDS directly. Instead, they measure the refractive index of the liquid—a characteristic related to the speed of light in the liquid—and then estimate TDS using an empirical relationship between refractive index and TDS. This relationship between refractive index… Continue reading Estimating TDS from Refractive Index