MA - VPH Primary Calibration Spike Back Catalog number: 91757 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9209.15-100-MEX5 O-Desmethyl tramadol hydrochloride , 100µg base/mL, Solvent-methanol, Unit 1mL, # of units-5, Cas.no. Price on request 675407 Azinphos-ethyl, 10.0 µg/ml, Acetonitrile, 10ml Price on request 38029 WS Chlordane Price on request