Usage: To use the alignment tool, ensure the arrow on the side is aligned with the master key of the D38999 and plug into the connector. The EXFO probe slides into each of the 19 chambers to image the fiber face. After cycling through the chambers, rotate the adapter by 180 degrees (leave plugged into the D38999), where you should hear/feel a small click or detent and verified by the white arrow on top aligning with the side arrow. Using the chambers again, the additional 18 fiber faces can be inspected.