Calcium Hardness Back Catalog number: 54143 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 8384.38-K-ME Ditallow dimethyl ammonium chloride, hydrogenated form, 1000µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 61789-80-8 Price on request 2092.13-K-5IP 2,4-Dibromophenol-PFB, 1000µg/mL, Solvent-isopropanol, Unit 5mL, # of units-1, Cas.no. Price on request 3401.22-100-AN Fenpropathrin Price on request