Our Certificates of Analysis (CofAs) include a certified expanded uncertainty value. In reference standards, \u201cuncertainty\u201d is a quantitative measurement that determines the quality of a standard. It\u2019s used to provide a margin of error that could potentially apply to the product. It\u2019s important to note, however, that unless your analysis results require the presentation of uncertainty, it may not be necessary for you to use the uncertainty value provided on your CofA.<\/p>\n\n\n\n