Abstract: Highly stable floating platform for measuring surface and subsurface environmental variables. It consists of a main toroidal body, inside of which equipments are installed, mainly on its base, to maintain low and nearby the centers of gravity and of buoyancy, allowing the in situ inspection, maintenance and installation of equipments. One winch in its interior allows the translation of equipment and/or to take water samples, from surface to a user-defined depth, using a cable deployed through the center of the platform, for providing power and communication with the surface to said equipment.