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An automated apparatus is presented that allows a user to measure the mass spectrum or velocity map images of photofragments during tuning of the dye-laser radiation wavelength and its second harmonic, which interact with an investigated substance in a molecular beam. The NI LabVIEW environment was used for automation. The apparatus was successfully tested when studying the resonant ionization of oxygen molecules. The automation software makes it possible to extend the possibilities of measuring spectral dependences by creating additional modules without modifying the existing program code.