Measuring Total Dissolved Solids: A Refractometer Comparison

 http://socraticcoffee.com/2015/04/measuring-total-dissolved-solids-a-refractometer-comparison/

Abstract
The goal of these two studies was to examine the measurements from two refractometers advertised to measure the total dissolved solids (TDS) content of coffee. Utilizing mixed study designs, the VST LAB Coffee II Coffee & Espresso Refractometer (the newer VST LAB Coffee-Espresso III will be tested soon) was compared against the Atago PAL-COFFEE refractometer in two different experiments. For the first study, distilled/demineralised water was used to zero the refractometer in one condition and brew water was used to zero in the other condition. Our results demonstrated no significant difference in the readings between the VST and Atago refractometers, nor between the two water types. Another experiment was performed to assess the impact of the syringe sample filters supplied by VST. Our results demonstrated a significant difference between refractometers (p = 0.04), a significant effect of filter use on TDS reading (p = 0.02), as well as a significant interaction between filter use and temperature (p = 0.01).

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