Spectrometer calibration is an essential step for all spectroscopic applications. All our spectrometers are calibrated during production and quality control (QC). This process is carried out using calibration light sources with known spectral lines. During this process, light from a calibration light source (the choice of which depends on the configuration of the spectrometer to be calibrated) connected to the spectrometer, passes through various optical elements, including a dispersive grating, and eventually reaches the array detector. Finding the relationship between the pixel positions of the spectral lines of the calibration light source measured by the detector and their wavelengths is carried out using special software developed by Avantes. The calibration accuracy depends directly on the chosen peaks and the accuracy of their calculated positions/wavelengths. The internship aims to analyze all available data, redefine a wavelength accuracy per spectrometer configuration and light source used for calibration, and implement your findings to the calibration software.