The DelsaMax PRO light scattering analyzer makes fast and reliable measurements of nanoparticle electrophoretic mobilities. Besides being capable of swiftly measuring mobilities of large particles such as liposomes and virus-like particles (VLPs), the DelsaMax PRO light scattering analyzer is a laser-based instrument that achieves reproducible measurements of traditionally very challenging protein samples including antibody formulations, bovine serum albumin, and lysozyme. The QELS function provides simultaneous measurement of the macromolecular hydrodynamic radius utilizing backward scattered light to determine the sample translational diffusion coefficient. A reusable flow-through cell is used for mobility and QELS measurements. The flow-through cell can be plumbed in either a flow or batch configuration. However, you need to stop the flow in order to take a mobility measurement. Samples can be introduced by manual injection, an autosampler, syringe pump, or an auto-titrator. The DelsaMax PRO light scattering analyzer also has a temperature control capability and is able to perform automated temperature studies.