The Flex P is validated to resolve quantity of particles and distribution of sizes non-destructively in containers. This system is sensitive to count and track sub-visible and visible particles in solution. The tracking algorithms are important so that the machine has reduced double counting as well as particle in solution can be characterized where other vision systems are fooled by particle and surface defects on the container. Also tracking algorithms are important so that air bubbles are not considered particles. The Flex P system is designed to accommodate a range of common primary container sizes without changing parts. The optics and automation at the heart of the Flex P system are the same as our higher speed satellite system, but are designed to be compact and well suited for lab environments.