Medical Marijuana Heavy Metals Calibration Back Catalog number: 50712 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 71220 n-Tetracontane Price on request 678248 Bentazone-8-hydroxy, 100 µg/ml, Acetonitrile, 1m Price on request 675791 PCB 136, 10 µg/ml, Isooctane, 10ml Price on request