Calibration Standard Mix 4 Back Catalog number: 52036 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9408.15-100-ME alpha-Hydroxymetoprolol, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 56392-16-6 Price on request 30003 EPA Method 500 Series Internal Std #4 Price on request A618001-5MG 3-Amino-1-methyl-5H-pyrido[4,3-b]indole Acetate, 5mg Price on request