WP Total Hardness Back Catalog number: 54597 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 3001.9-K-CY 2,3,4-Trimethylhexane, 1000µg/mL, Solvent-cyclohexane, Unit 1mL, # of units-1, Cas.no. 921-47-1 Price on request TBDE-83R Great Lakes Chemical DE-83™ Decabromodiphenyl Oxide, 1.2ml x 100ug/ml, toluene Price on request 50110G TOC Calibration Standard Price on request