The only method used to date to measure the size and abundance of the Large Particulate Matter (LPM) and zooplankton with sensors mounted on profiling floats is based on imagery.

The only instrument that can be fixed on the outside of a profiling float and connected to ensure power and communication is the UVP6-LP (https://doi.org/10.1002/lom3.10475). It is a miniaturization of the UVP5 marketed since 2008, whose data are gathered into the EcoPART(https://ecopart.obs-vlfr.fr/) database.

The purpose of this document is to introduce the measures provided by the sensor and their post-processing and to ensure that all countries deploying floats equipped with UVP6 sensors document the data and metadata related to these floats properly.