The invention relates to a medical device in combination with an optical reading device comprising at least one sensor, a meter display for displaying a matrix of pixels and a meter control unit adapted for controlling the meter display so that at least one measurement value measured by the sensor and/or a value derived thereof is encoded in an optical machine-readable signal, wherein the optical reading device is adapted to read the optical machine-readable signal from the medical device, to decode the optical machine-readable signal and to generate a message corresponding to the decoded optical machine-readable signal.
