Perchlorate Level 4 Back Catalog number: 59342 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 10249.13-50-ME 2,4-Dihydroxybenzophenone-13C6, 50µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 131-56-6 (unlabelled) Price on request M312153 1-Methylhistamine Dihydrochloride, 25mg Price on request 3345.7-100-HX Chlorpyrifos-methyl, 100µg/mL, Solvent-hexane, Unit 1mL, # of units-1, Cas.no. 5598-13-0 Price on request