A manometric probe gauge, comprising: a main body , provided with a longitudinal axis (X); an extensible membrane , associated to an outer surface of the main body so as to delimit a chamber external to the main body ; feeding means arranged to allow feeding of a fluid into the chamber ; wherein: the membrane exhibits a substantially tubular shape and is sealingly connected to the outer surface of the main body in at least two annular junction areas , the annular junction areas (31a, 32,a) comprise two end edges of the membrane ; the main body exhibits a narrowing , which extends between the two annular junction areas ; the main body exhibits a cylindrical shape which is concentric to the longitudinal axis (X); the sealing conjunction between the end edges of the membrane and the outer surface of the main body extends along a stretch of a pre-determined length in the longitudinal axis direction (X), in particular a stretch of a pre-determined length of said cylindrical shape; between the membrane and the outer surface of the main body , disposed in the vicinity of the end edges , two annular junction bands are defined; characterized in that : the main body , at a distal end thereof, is closed by a plug ; said plug is associated to the main body with snap-engagement of a detachable type, so that removal of the plug is allowed. a main body , provided with a longitudinal axis (X); an extensible membrane , associated to an outer surface of the main body so as to delimit a chamber external to the main body ; feeding means arranged to allow feeding of a fluid into the chamber ; wherein: the membrane exhibits a substantially tubular shape and is sealingly connected to the outer surface of the main body in at least two annular junction areas , the annular junction areas (31a, 32,a) comprise two end edges of the membrane ; the main body exhibits a narrowing , which extends between the two annular junction areas ; the main body exhibits a cylindrical shape which is concentric to the longitudinal axis (X); the sealing conjunction between the end edges of the membrane and the outer surface of the main body extends along a stretch of a pre-determined length in the longitudinal axis direction (X), in particular a stretch of a pre-determined length of said cylindrical shape; between the membrane and the outer surface of the main body , disposed in the vicinity of the end edges , two annular junction bands are defined; characterized in that : the main body , at a distal end thereof, is closed by a plug ; said plug is associated to the main body with snap-engagement of a detachable type, so that removal of the plug is allowed. the membrane exhibits a substantially tubular shape and is sealingly connected to the outer surface of the main body in at least two annular junction areas , the annular junction areas (31a, 32,a) comprise two end edges of the membrane ; the main body exhibits a narrowing , which extends between the two annular junction areas ; the main body exhibits a cylindrical shape which is concentric to the longitudinal axis (X); the sealing conjunction between the end edges of the membrane and the outer surface of the main body extends along a stretch of a pre-determined length in the longitudinal axis direction (X), in particular a stretch of a pre-determined length of said cylindrical shape; between the membrane and the outer surface of the main body , disposed in the vicinity of the end edges , two annular junction bands are defined; characterized in that : the main body , at a distal end thereof, is closed by a plug ; said plug is associated to the main body with snap-engagement of a detachable type, so that removal of the plug is allowed. the main body , at a distal end thereof, is closed by a plug ; said plug is associated to the main body with snap-engagement of a detachable type, so that removal of the plug is allowed. <EOS>