Multi-channel metering with automatic calibration, in which the individual metering channels 1, the micro-valves 4 are connected to outputs of a distributor 8, 13 or 15, the input of which is filled from an associated vessel 9, 14 or 17 with liquid, can each be calibrated by is arranged between the vessel 9, 14 or 17 and the input of the distributor 8, 13 or 15, a flow sensor 10 which detects the flow volume for the calibration during the dispensing of the liquid through a nozzle 2 of a metering channel 1 and generates signals corresponding to a defined opening time a micro-valve 4 and a particular dosing 1 assigned and stored, an individual control of the micro valves allows to compensate tolerances of the metering channels 1 to each other.