A manometric probe gauge, comprising: a main body, provided with a longitudinal axis; 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 (51,52) 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 (31a, 32a), the annular junction areas (31a, 32,a) comprise two end edges (31, 32) of the membrane; the main body exhibits a narrowing, which extends between the two annular junction areas (31a, 32a); the main body exhibits a cylindrical shape which is concentric to the longitudinal axis; the sealing conjunction between the end edges (31, 32) 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, 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 (31,32), two annular junction bands (31a, 32a) 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; 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 (51,52) 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 (31a, 32a), the annular junction areas (31a, 32,a) comprise two end edges (31, 32) of the membrane; the main body exhibits a narrowing, which extends between the two annular junction areas (31a, 32a); the main body exhibits a cylindrical shape which is concentric to the longitudinal axis; the sealing conjunction between the end edges (31, 32) 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, 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 (31,32), two annular junction bands (31a, 32a) 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 (31a, 32a), the annular junction areas (31a, 32,a) comprise two end edges (31, 32) of the membrane; the main body exhibits a narrowing, which extends between the two annular junction areas (31a, 32a); the main body exhibits a cylindrical shape which is concentric to the longitudinal axis; the sealing conjunction between the end edges (31, 32) 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, 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 (31,32), two annular junction bands (31a, 32a) 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.