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 66184 PCB No. 184, 100µg/ml in Isooctane, 1ml Price on request 53034 Calibration Standard Mix 2 Price on request L18000062CY Pesticide-Mix 62, 10µg/ml in Cyclohexane, 10ml Price on request