In this specific experiment, 0.8% accuracy was achieved using air as the single calibration point. The reason for the accuracy specification to have a range of ± 1.7% – 0.5% RD is that the accuracy is highly dependent on the geometries and architecture of the transducer set-up. Thus, these are accuracy values that were achieved experimentally using different size pipes across a range of flow rates and concentration ranges. These values should be interpreted as accuracies that can be achieved.