Table 2 shows the reproducibility of the system at different dilution factors. The robustness of the system was further examined by continuously running
the system all day long. Excellent performance was achieved: precisions at a dilution factor of 1000 were 3.0% R.S.D. (n = 360) and 2.6% R.S.D. (n = 345) on
two separate days, respectively. For comparison, the stability of the previous system [14] using peristaltic pumps was also tested. The short-term precision was 2.0% R.S.D. (n = 15) whereas the long-term precision was 6.8% R.S.D. (n = 355). The superior precision