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The V-650/660/670 are double-beam spectrophotometers with a photomultiplier tube detector. The high sensitivity of the PMT detector enables accurate measurements of low concentration samples. By controlling the high voltage applied to the PMT, the dynode feedback system allows a wider dynamic range. It also enables the use of such solid sample handling accessories as integrating spheres to collect diffuse light transmitted or reflected by the sample. The advanced optical design offers high optical throughput and low stray light for extended absorbance linearity with the capability for high resolution measurements as low as 0.1 nm for gas and vapor phase spectroscopy.