A docking device for coupling a test device (31) or storage device (30) (first device) for interface units (33) for testing electronic components to at least one handling unit (32) for handling and/or transporting interface units (33) (second device), has a first docking element (1) and a second docking element (2), the first docking element (1) being movable relative to the second docking element (2) and being fixable in an end position. A sensor arrangement is provided for detecting the end position of the first docking element (1) relative to the second docking element (2) on the side of the first device and/or on the side of the second device.