The BD Accuri C6 is the newest generation of desktop flow cytometers. It provides enhanced sensitivity and reliability over previous models. It is equipped with an argon blue laser (488 nm) that can count and distinguish between groups of marine pico-phytoplankton and heterotrophic prokaryotes below 5 µm. With its compact 11 x 14.75 x 16.5-inch footprint, light weight of 30 lb., and operational simplicity, the BD Accuri C6 allows the system to be installed on board any research vessel so that in situ fresh samples can be run in the field.