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Spectrum offers laboratory grade Photometers from the industry’s leading manufacturers including Hanna, Thermo Scientific, Reichert, Unistat, and others. Whether you require a luminometer or portable single parameter photometer, Spectrum has the photometer solution for you. Photometers are instruments that measure optical properties or light intensity of a solution or surface. Hanna’s Portable Free Chlorine Photometer uses a positive-locking system to guarantee the cuvette is in the same position every time it is placed into the