Method 1640 Tuning Standard Back Catalog number: 52147 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70231 4-Nitrophenol Price on request 2859.9-50-ME 1H,1H,2H,3H-Perfluoronon-2-en-1-ol , 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 38550-47-9 Price on request 8444.15-10MG 1-Ethyl-2-phenylbenzimidazole, neat, Solvent-neat, Unit 10MG, # of units-8, Cas.no. 6528-75-2 Price on request