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One of the factors affecting the successful transfer of calibrations between different near infrared filter instruments from the same production line is the existence of small differences in the wavelength response of nominally identical filters. A method is described for standardising spectral data from a production instrument to correct for wavelength differences between its filters and those of a master instrument. A chemometric approach combines spectral scans of both sets of filters with information about the spectra of the samples to be measured in order to derive appropriate corrections. The result is a matrix of correction factors that can be programmed into the instrument to improve calibration transferability.