Abstract: A device (10), specifically tailored to measure the development of soil and, preferably, of seabed surface (14) profile is characterized by a waterproof/airtight casing housing: an hydraulic pressurized circuit (15), extending along a longitudinal direction, filled with a specific liquid; a pneumatic circuit (16), extending along the same longitudinal direction, and connected to the above hydraulic circuit (15) at one or more points; this pneumatic circuit (16) is filled with air kept at a constant pressure, or with inert gas allowing pressurization of the above said hydraulic circuit (15); a number of differential pressure transducers (18, 20, 22), placed at the above said one or more connections between the hydraulic circuit (15) and the pneumatic circuit (16); an electronic control circuit including: means for data acquisition, (said data come from the above said pressure transducers (18, 20, 22) and are related to pressure measurements at each of said one or more points); means for calculation of press

Abstract: A high-sensitivity device for measuring the mutual level differentials among a certain number of reading locations, the device comprising a plurality of containers, one for each reading location, mutually connected at the bottom ends by a piping opening into a balancing tank which holds a liquid mass. Each container is equipped in its interior with a float which is held spaced apart from the container walls by flexible retaining members, a level-differential sensitive transducer being mounted in correspondence with the walls. The apparatus further comprises a device for measuring the signals delivered by the transducers.