With the field tool, the polarity of MTP® PRO cables can be changed from key up to key down. No accessories are required since both keys are pre-installed in the MTP® PRO connector. The pins can also be changed from male to female. This operation requires pin ex-changer as accessories, it can be done without opening the connector. The advantage of this tool is that even an unskilled and untrained technician can easily manage polarity and pin reconfiguration right in the field in a minute without needing to remove the connector housing, expose any fibers or perform any other disassembly of the connector.