Request InfoBristol Instruments Inc.Bristol Instruments has introduced its 621 series of laser wavelength meters. Bristol said it used its expertise in optical interferometry to provide an instrument that measures laser wavelength accurately and reliably. Two versions of the 621 series are available. The model 621A is for the most demanding experiments, measuring absolute wavelength to the highest accuracy of ± 0.2 ppm. For experiments that are less exacting, the model 621B is a lower-priced alternative. This system measures laser wavelength to an accuracy of ± 1.0 ppm. 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