For USP643 validation. Composed of 1 bottle of 500 µg/L USP sucrose TOC standard solution, 1 bottle of 500 µg/L USP 1,4-benzoquinone TOC standard solution, and 1 bottle of blank water. 40 mL crimped vials. Made with USP standard reagents. Expiration date 3 months. For TOC-1000e.