The Refeyn TwoMP Mass Photometer enables precise, label‑free measurement of individual biomolecules directly in solution. Its high sensitivity and minimal sample requirements make it ideal for assessing protein purity and homogeneity, studying oligomerization, and analyzing molecular interactions such as protein complex formation. The instrument is widely used in biopharmaceutical quality control (including monoclonal antibodies) and in the characterization of viral vectors like AAV for gene therapy. It supports research teams in biochemistry, molecular biology, biophysics, and biotechnology.