The Beckman Coulter XL flow cytometer combines the analytical power of a research system into a compact and ergonomically designed unit that speeds up sample throughput. This model is self-contained and biohazard safe. User-adjustable filter elements increase both flexibility and versatility in research settings. It is highly capable of analyzing up to four colors of immunofluorescence from a single air cooled laser. The XL model is ready for other multi-color applications including multiparametric DNA analysis, platelet studies, reticulocyte enumeration, cell biology/functional studies and as well as a broad range of research applications.