Calibration Standard Mix 2 Back Catalog number: 53034 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended L-PFNS Sodium perfluoro-1-nonanesulfonate, 1.2ml x 50ug/ml, methanol Price on request 679036 4-Chloro-2-nitroaniline, 500mg Price on request 54156 WP Total Hardness Price on request