The EXFO PMA-54 is an SC connector adapter designed as an add-on or replacement interface for the EXFO EPM-50 optical power meter, used to test signal loss across fiber optic connectors during OTDR and power meter testing workflows. Swapping in this adapter lets technicians quickly reconfigure the EPM-50 for SC-terminated fiber optic cable without purchasing a new meter, saving time during field acceptance testing and troubleshooting. It's built to EXFO's precision tolerances to preserve accurate power readings across single-mode and multimode fiber links. Keep a PMA-54 (Millennium part 30139) in your test kit for fast connector-type changeovers on any job site.