A dispenser, e.g. for a pharmaceutical, perfume or cosmetic fluid product expelled by a manually-operated pump or valve (10) through a head (20) with an outlet (25), incorporates a detector (30) that detects and indicates the successful passage of a dose of the product. The dispenser, e.g. for a pharmaceutical, perfume or cosmetic fluid product expelled by a manually-operated pump or valve (10) through a head (20) with an outlet (25), incorporates a detector (30) that detects and indicates the successful passage of a dose of the product. The detector, which is located in the dispenser's discharge channel (50), can operate by dynamic pressure, by using a piezoelectric material, a breathing polymer or an optical fibre associated with a deformable membrane.
