A method is provided for calibrating a spectrometer device used for Raman scattering analysis. The transmitted middle channel is FM-modulated by a suitable frequency. The handle is movable between a first position, in which the clamp releasably holds the cover in its closed position, and a second position, in which the cover is free to be moved to its open position. The database of complete search queries is searched to identify a second set of complete search queries matching any of the first set of rewritten partial search queries.