Method 1640 Tuning Standard Back Catalog number: 53147 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 91986 Surrogate Mix Price on request 673974 4-Nitrophenol, 100 µg/ml, Methanol, 5ml Price on request 11423.13-K-ME Ranitidine hydrochloride,1000 µg base/mL,MeOH,1mL, Price on request