Medical Marijuana Heavy Metals Calibration Back Catalog number: 50712 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 57155 Cesium (Cs) Price on request 15900-2935-100AN5 Isoproturon-desmethyl, 100µg/ml in ACN, 5ml Price on request 673593 Fenthion, 10 µg/ml, Ethyl acetate, 10ml Price on request