| Summary: | Hydrothermal synthesis is an emerging bottom-up technique to produce nanostructure in much facile way. Nevertheless, the attention to gauge repeatability and reproducibility (GR&R) on measurement tools used during the synthesize process was not given accordingly. In this work, an assessment on pH meter was conducted since pH value is one of the main parameter need to be precisely controlled in WO3 hydrothermal synthesis process. Using ANOVA method, series of measurement metrics was developed and later analyzed statistically using Minitab software. Initially, GR&R value of 17.55% was calculated and when the study repeated with revised measurement procedure, the GR&R was further reduced to 2.05%. This value proved that the pH meter used for the measurement is very reliable. This will ensure pH value was accurately measured hence a consistent and controlled nanostructure produced via hydrothermal synthesis can be achieved. © 2014 American Scientific Publishers. All rights reserved.
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