WP Total Hardness Back Catalog number: 54156 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8964.23-100-ME 3-Chloro-1,2-propandiol-2-monogadolenate, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. Price on request 8103.3-100-ME Acrylamide-1-13C, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 287399-24-0 Price on request 11149.12-50-T ß-Hexabromocyclododecane,50 µg/mL,toluene,1mL, Price on request