NASA technicians and Engineers from SRON, the Netherlands Institute for Space Research, integrate the SPEXone instrument to the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) Spacecraft at NASA Goddard Space Flight Center in Greenbelt, Maryland on June 13th, 2022. SPEXone is a compact, optical satellite instrument that will characterize aerosols from low Earth orbit as part of the NASA PACE mission. SPEXone is one of three instruments on NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) observatory and has been developed by a Dutch consortium consisting of SRON Netherlands Institute for Space Research and Airbus Defence and Space Netherlands, supported by opto-mechanical expertise from TNO. SRON and Airbus DS NL are responsible for the design, manufacturing and testing of the instrument. The scientific lead is in the hands of SRON. SPEXone is a public-private initiative, funded by the Netherlands Space Office (NSO), the Netherlands Organization of Scientific Research (NWO), SRON and Airbus DS NL.