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The WALS-demonstrator can be used to determine particle characteristics during the production of nanoparticles. To that end, different laser-optical measurement techniques are combined. Laser-induced incandescence (LII) allows the determination of primary particle size and volume concentration, while wide-angle light scattering (WALS) can be used to measure the size and shape of particle clusters. With the help of an ellipsoidal mirror, high-resolution scattering data can be obtained, from which particle size distributions can be determined. The user receives the results on aerosol characteristics in quasi real-time.