Utilizing CertiFiber's dual-fiber measurement method, when placed in bi-directional test mode, CertiFiber measures the fiber pair in one direction. It then prompts you to swap connections at the patch panel or outlet and proceeds to measure the fiber pair in the other direction. Unlike the traditional power meter and light source combination, you do not need to swap CertiFiber's main and remote test units, providing tremendous time-savings for each fiber link tested.

Using loopback mode, CertiFiber's main unit can function independently from the remote. Loopback mode is useful when measuring a single fiber on a reel or spool since both fiber ends must be near one another.