WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 31531 p-Xylene Price on request 2199.11-K-ME 2-Methyl-1-nitronaphthalene, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 881-03-8 Price on request 681249 Metazachlor Metabolite 479M6, 10mg Price on request