When a zeta sizer result shows "acceptable" but includes a note to "refer to quality report," it means that while the data has been processed and a result is provided, there might be aspects of the measurement that need closer inspection to confirm the reliability of the results. Here's a breakdown of what this implies:
As Mani Sharma explained, the Quality Report might indicate any issue that might need to be checked for a better quality of the result. For example, it can indicate too much variability of the measured signals so that the dispersion is not stable or the measurements should be repeated (more measurements might be needed), or also that the sample might be too diluted or have fluorescence, which can lead to misleading results. Sometimes even the presence of an impurity or bubbles can lead to significant errors in the measurement, so checking the cuvette before measurement is also recommended.
A technical note on this subject from the manufacturer is at https://www.malvernpanalytical.com/en/learn/knowledge-center/technical-notes/tn101104zetapotentialqualityreportzetasizernano
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