3822.90.00.00 - Certified reference materials

This category specifically encompasses "Certified reference materials." These are materials or substances with one or more properties that are sufficiently homogeneous and stable with respect to the chosen metrological property and its assigned value(s) for use in a measurement or in a calibration. Crucially, they are accompanied by a certificate that details the value of the property, its associated uncertainty, and a statement of metrological traceability, ensuring their reliability for calibration and quality control purposes across various industries, including analytical testing, manufacturing, and research.

While the immediate parent category includes diagnostic and laboratory reagents, Certified Reference Materials (CRMs) are distinct. CRMs are not intended for direct use in diagnostic procedures or general laboratory testing where their primary function is to perform a specific analysis. Instead, CRMs serve as a benchmark or standard against which the accuracy and reliability of laboratory measurements and analytical methods can be verified. Their value lies in their metrological traceability and the documented uncertainty associated with their assigned properties, making them indispensable tools for quality assurance and inter-laboratory comparisons.

As a leaf node within the HTS, this classification represents the final level of detail for Certified Reference Materials. Therefore, there are no further subcategories to introduce. Classification within this code is generally determined by the product's nature as a CRM, irrespective of the specific analytical property it certifies or the industry it serves, provided it meets the stringent criteria of certification and metrological traceability.