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The double beam spectrophotometer measures the ratio of the light intensity on two different paths. A single beam spectrophotometer measures the absolute light intensity. However, both are easy to use, reliable and efficient. In additional to offering quality spectrophotometers, The Lab Depot also carries a complete selection of Spectrosil spectrophotometer cells and disposable Cuvettes. When you think quality spectrophotometers, think of The Lab Depot.