Description General description This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis. Specifications View example COA for QC1041 Note - The link provided is an example certificate of analysis (COA) only and may not be the lot that you receive. All analytes may not be present or certified for each lot, and analyte concentrations will vary by lot. Other Notes Values of analytes vary lot to lot.