SPEX CertiPrep Inc., of Metuchen, N.J., has increased flexibility in ordering customized standards. Now, customers can choose between 100 ml, 250 ml, 500 ml and 1L volumes. Liters are always packaged in two 500-ml bottles for convenience. Five-hundred ml and 1L volumes can be packaged in smaller bottles, if desired. Custom standards are available from all product lines. The company’s custom certified reference materials are manufactured under an accredited ISO 9001 quality assurance system.