Literally millions of measurements of elemental composition are performed each year worldwide. The vast majority of these measurements depend upon reference materials for establishing traceability of results to the SI. Leveraged through commercial CRM producers, the NIST SRM 3100 series provides an efficient and effective way to establish this traceability. As a result, the quality of elemental determinations and comparability between laboratories are improved. Enhancements in the SRM 3100 series continue to benefit the analytical community.