Technicians use various tools to install, maintain, and troubleshoot fiber cabling: detection and verification testers, certification testers, inspection cameras, cleaning supplies, certification testers, and advanced optical time domain reflectometer (OTDR) instruments for. Technicians use various tools to install, maintain, and troubleshoot fiber cabling: detection and verification testers, certification testers, inspection cameras, cleaning supplies, certification testers, and advanced optical time domain reflectometer (OTDR) instruments for. Fiber testing is the process of verifying the performance of optical fiber cabling. This process includes a range of tests and measurements such as insertion loss, optical return loss, and fiber length. Fiber optic power meters measure the average optical power out of. AFL designs test and inspection tools that are easy to use and provide quick results, without complicated training requirements. With the widespread use of optical fibers in high-speed communication, high-performance, reliable, and stable optical fibers are crucial for networks, making fiber optic detection a very important task.