13C3-Caffeine, 100 µg/ml, Methanol, 1ml Back Catalog number: 681491 Manufacturer: HPC STANDARDS GmbH Availability: In the manufacturer's stock Price on request - + Recommended MA9065 111800 µS/cm calibration solution (230mL) Price on request ACQ-SE30-115 Ethanol standard in serum,3.0g/L,serum, 1.5mL Price on request 675686 D3-TFNG, 5mg Price on request