Pressure indicator comprising a base, a deformable membrane fixed to the base in a fluid-tight manner according to a closed contour, and a body fixed to the base, delimiting a hollow volume covering the deformable membrane on the side opposite the base, while encompassing at least the closed contour, at least one inlet for a fluid the pressure of which is to be measured in a pressure range, wherein the deformable membrane is such that the expansion thereof for said pressure range is sufficient to be visible to the naked eye and to allow a direct display indicative of the pressure, in that the base is drilled with at least one first hole a first end of which emerges between the deformable membrane and the base in the closed contour, in that the body is drilled with at least one second hole a first end of which emerges into said hollow volume, in that the other end of the first hole is linked to the inlet respectively to the open air, in that the other end of the second hole is linked to the open air, respectively to the inlet, so that a pressure, respectively a pressure reduction, of fluid at the inlet causes an expansion of the deformable membrane in the hollow volume delimited by the body. Application of such an indicator to the monitoring of the inflation of a medical apparatus pad.Indicateur de pression comprenant un socle (2), une membrane déformable (3) fixée au socle (2) de manière étanche aux fluides selon un contour fermé (6), et une cloche (4) fixée au socle (2), délimitant un volume creux recouvrant la membrane déformable (3) du côté opposé au socle (2), en englobant au moins le contour fermé (6), au moins une embouchure d'entrée (5) d'un fluide dont on veut mesurer la pression dans une plage de pression, où la membrane déformable (3) est telle que son expansion (E) pour ladite plage de pression soit suffisante pour être détectable à l'œil nu et permettre un affichage direct indicatif de la pression, en ce que le socle (2) est percé d'au moins un premier t
