Dosing unit for dosing singulated particles or granules to a blending recipe, the unit comprising: - a housing with an inlet for the particles or granules, and a storage compartment for the particles or granules; - a suction channel that is provided in the housing; - a rotatable transfer element with one or more suction openings that moves relative to the suction channel and is provided between the suction channel and the storage compartment such that one particle of granule is picked up by one of the one or more openings and carried from the storage compartment to the blending recipe for dosing; - a singulator configured for singulating the particles or granules when transferred by one of the one or more openings of the transfer element; - an outlet for providing the singulated particles or granules to the blending recipe; - a sensor configured for proactively measuring the dosing of a singulated particle or granule, wherein the sensor is configured for measuring the presence of a singulated particle or granule in or in front of an opening in transfer element, such that a measurement signal is achieved; - a controller (58, 60) configured for receiving the measurement signal from the sensor prior to the actual dosing of the particle or granule to the blending recipe, characterized in that the controller (58, 60) is capable of correcting the dosing; - wherein the sensor comprises a transmitter configured for transmitting a signal through the opening of the transfer element such that the presence of a particle or granule in or in front of the opening is detected prior to the actual dosing of the particle or granule to the blending recipe. - a housing with an inlet for the particles or granules, and a storage compartment for the particles or granules; - a suction channel that is provided in the housing; - a rotatable transfer element with one or more suction openings that moves relative to the suction channel and is provided between the suction channel and the storage compartment such that one particle of granule is picked up by one of the one or more openings and carried from the storage compartment to the blending recipe for dosing; - a singulator configured for singulating the particles or granules when transferred by one of the one or more openings of the transfer element; - an outlet for providing the singulated particles or granules to the blending recipe; - a sensor configured for proactively measuring the dosing of a singulated particle or granule, wherein the sensor is configured for measuring the presence of a singulated particle or granule in or in front of an opening in transfer element, such that a measurement signal is achieved; - a controller (58, 60) configured for receiving the measurement signal from the sensor prior to the actual dosing of the particle or granule to the blending recipe, characterized in that the controller (58, 60) is capable of correcting the dosing; - wherein the sensor comprises a transmitter configured for transmitting a signal through the opening of the transfer element such that the presence of a particle or granule in or in front of the opening is detected prior to the actual dosing of the particle or granule to the blending recipe.