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  • Photometers that determine the absorbance or transmission of the light energy transmitted through a solution (or a gas) at a fixed (typically, 40 nm) bandwidth. Their principal components are a stable light source, broadband filters, a cuvette or test tubes for samples, a photodetector, appropriate electronics to process the detector signal, and a means of displaying the results. These instruments have clinical applications primarily for the quantitative analysis of biological substances and enzymes or drugs and their metabolites in specimens.
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