Abstract: A device includes: a frame; a tray supported by the frame; a measurement device configured to weigh debris loaded on the tray; wherein the tray has a front end and a rear end with a first side and a second side each extending therebetween; wherein the first side has a first protrusion and a second protrusion with a movement member being configured to make the first protrusion follow a first trajectory; a guide is configured to make the second protrusion follow a second trajectory while the first protrusion is moved along said first trajectory; wherein the movement member is configured to act on said first protrusion so as to roto-translate the tray between a first position, wherein the tray is configured to carry debris to be weighted, and a second position wherein the tray is configured to discharge the debris.