WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3773.6-K-IO 2,6-Dimethylpyrazine, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-, Cas.no. 108-50-9 Price on request 79267 o-Terphenyl Price on request C17684500 Trichloroacetic acid sodium salt, certified, 0.25g Price on request