This tool can be right clicked on a logistics pipe to show the items sent, received and relayed by the pipe during this session and over the lifetime of the pipe.
Right clicking on nothing will show a GUI to clone module settings and adjust the colours of Logistics Item Cards. Put the module to copy from in slot 1 and the module to copy to in slot 2. The module in slot 2 will be moved to slot 3 with the settings copied.
Placing item cards in slot 4 and clicking the surrounding buttons will change the colours the item card displays when shift is held. These colours do not influence the link between cards in any way, they are just cosmetic.