Apparatus (1) for monitoring and determining the milk quality category of milk in a milk storage tank (2) comprises a plurality of milk quality sensors (19) located in the milk storage tank (2), and milk quality sensors (28) located in a milk delivery pipeline (6) for delivering milk to the milk storage tank (2) from a milking system (5). A microprocessor (17) reads signals from the milk quality sensors (19) for determining the quality of the milk in the milk storage tank (2), and determines the data indicative of the milk quality category of the milk in the milk storage tank (2), which is stored in a memory (20) of the microprocessor (17). A communications module (22) wirelessly transmits via the internet (25) the data indicative of the milk quality category of the milk in the milk storage tank (2) to a central server (18), which in turn is stored in a memory (26) of the central server (18). A creamery is permitted access to the data indicative of the milk quality category of the milk stored in memory (26) prior to collection of milk from the milk storage tank (2). By comparing signals read from the milk quality sensors (28) in the milk delivery pipeline (6) with signals read from the milk quality sensors (19), it is possible to determine if the milk storage tank (2) is harbouring bacteria. Discharge rinse water quality sensors (30) are located in an outlet port (10) from the milk storage tank (2) and in a rinse water delivery pipeline (14) to the milk storage tank (2) for determining the cleanliness of the milk storage tank (2).L'invention concerne un appareil (1) destiné à surveiller et déterminer la catégorie de qualité de lait du lait dans un réservoir de stockage de lait (2) comprenant une pluralité de capteurs de qualité de lait (19) situés dans le réservoir de stockage de lait (2), et des capteurs de qualité de lait (28) situés dans une conduite de distribution de lait (6) destinée à distribuer du lait vers le réservoir de stockage de lait (2) depuis un syst
