The objective of this study was to determine the possibility of using instrumental granulometric measurement method to control the smoothness of natural yoghurt. The investigated materials were samples of natural yoghurts purchased in the chain of retail stores and manufactured by various producers. The general sensory analysis, including texture parameters of the yoghurts investigated, was performed using a quantity descriptive method. A Mastersizer MicroPlus apparatus was applied to measure the size distribution of the solid particles in the emulsion samples under investigation. On the basis of the initial results of the investigation accomplished, the usefulness of this apparatus to control the smoothness of yoghurts was confirmed.