The invention relates to a humidity measuring device comprising a humidity measuring sensor (2) comprising a first surface (24) forming an air-filled chamber (4), the air-filled chamber (4) comprising the humidity measuring sensor (2) inside the chamber (4), the first surface (24) comprising a first barrier part (9) being permeable to air and water vapour. A second surface (25) arranged to surround the first barrier part (9), the second surface (25) comprising a second barrier part (8) being permeable to air and water vapour. The first barrier part (9) and the second barrier part (8) arranged successively to form a flow path between inside the air-filled chamber (4) and outside the second surface (25), an air gap (10) between the first barrier part (9) and the second barrier part (8) providing a capillary break.
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