Milk meter (10) for milking plants comprising: - an upper collecting chamber (30) delimited at the top by a covering membrane (33)； - a first discharge opening (22) connectable to a milk flow collector of a milking plant, said first discharge opening (22) is adapted to put the milk flow collector in communication with the upper collection chamber (30 )； - a lower measurement chamber (40) connected to and communicating with the upper collection chamber (30) by means of a second discharge opening (32)； - a shutter (31) comprising a central portion (36), adapted to open and / or close the second discharge opening (32), and an upper portion (37) connected to the central portion (36) and associated with the covering membrane (33) where the central portion (36) of the shutter (31) comprises a chimney (51) to discharge upwards, that is to say towards the upper collecting chamber (30) and towards the first discharge opening (22) , the air that rises from the lower measurement chamber (40) when the last chamber is filled with milk, characterized in that the milk meter further comprises a plurality of curved fins (53) that have helical curves and develop on the surface of the central portion (36) of the shutter (31) to impart a rotational movement to the milk mass within the upper collection chamber (30), where the central portion (36) of the shutter (31) comprises two shutters (51) and a connecting wall (52) that connects diametrically e to two shutters (51) to discharge the air.Medidor de leche (10) para plantas de ordeño que comprende: - una cámara colectora superior (30) delimitada en la parte superior por una membrana de cobertura (33)； - una primera abertura de descarga (22) conectable a un colector de paso de leche de una planta de ordeño, dicha primera abertura de descarga (22) está adaptada para poner en comunicación el colector de paso de leche con la cámara colectora superior (30)； - una cámara de medición inferior (40) conectada a la cámara de recogida superior (3
