WP Total Hardness Back Catalog number: 54156 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 9026.14-K-IO Benzyl salisylate-d4 (Benzyl 2-hydroxybenzoate-3,4,5,6-d4), 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 118-58-1 of unlab. Price on request 10229.14-100-ME Benzyl 4-hydroxybenzoate-2,3,5,6-d4, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 1219805-81-8 Price on request 70389 Furan Price on request