Graphical user interface of the mobile device. Graphical user interface on the mobile device displays the selected phenotyping scheme (A, above), which had been predefined by the user and stored on the PDA. After scanning or entering the id of the measured object (plant, plot) values can be entered or chosen (B) on the input page. When a number > 1 is entered into the multiplication box (A), the input page is shown repeatedly, thus permitting to enter several measurements for each id. The count number is added to the identifier string to generate a unique identifier (e.g. id-1, id-2). (C) Images can be displayed for categorical values.