Calibration Standard Kit Back Catalog number: 53089 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675811 Ethephon, 10 µg/ml, Acetonitrile, 10ml Price on request 679910 Matrine, 100mg Price on request 679761 6-Chloro-N-methyl-3-pyridinemethanamine, 100 µg/ml Price on request