1000 times concentrated tuning solution, 250 mL certified reference material. Contains 10 ppm Be, 5 ppm Co, 5 ppm Mn, 2 ppm Ce, 2 ppm In and 2 ppm Bi in 5% v/v nitric acid. For ICPMS. This standard is traceable to NIST and manufactured in accordance with stringent Quality Assurance guidelines. Up to four year expiration date in the sealed TCT bag and up to an additional year after removed from the package.