Abstract: A laboratory system, comprising: at least one rack comprising retainers, wherein the rack is adapted to carry laboratory sample containers inserted in the retainers, a handling device, wherein the handling device is adapted to insert sample containers in the retainers or remove containers from the retainers being placed at a processing position depending on location information indicating the location of the rack being placed at the processing position relative to the handling device, a plurality of teaching devices, wherein a respective teaching device is insertable into a retainer of the rack, and wherein at least two teaching devices are inserted into a corresponding retainer of the rack being placed at the processing position, and a location information calculating device, wherein the calculating device is adapted to calculate the location information of the rack being placed at the processing position depending on the location of the at least two teaching devices.