WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3074.11-100-IO 5-Methyl-2-naphthol, 100µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 66256-29-9 Price on request 683844 Iprobenfos, 100 µg/ml, Acetonitrile, 5ml Price on request 72636 Benzanthrone Price on request