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 SCP SCIENCE is a world leader in manufacturing and distribution of analyticalequipment, supplies, standards, and reference materials for the inorganic chemical laboratory. SCP SCIENCE offers a complete line of consumables for Atomic Absorption (AA) instruments. Hollow Cathode Lamps (HCL) are visually, optically, and electrically inspected to ensure the highest possible quality. High-Purity, High Density graphite tubes with low coefficient of thermal expansion are also available in stock. Direct replacements for HCL and graphite tubes are available for all AA instruments (Perkin Elmer, Varian, Buck Scientific, etc).