The present invention relates to a capacitive hygrometer a thin dielectric as well as its method of manufacture. / p & & p & the hygrometer according to the invention comprises a first electrode 3, one face 4 is oxidized, a layer 6 of an insulating material, the dielectrical constant varies with the quantity of water absorbed in contact with said face oxidized 4, a layer 8 of a metal is not very oxidizable rendered permeable to water by an appropriate treatment and constituting the second electrode 9, and at least one layer monomolecular 10, with an organic substance for protect said second electrode 9 against pollution. / p & & p & a measurement of the grade hygrometric of the air.
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