Essential Fiber Optic Test Equipment Explained OTDR Fiber Tester: Accuracy Over Long Distances An OTDR fiber tester (Optical Time Domain Reflectometer) is one of the most powerful tools in fiber optic testing. It works by sending light pulses down the fiber and measuring reflections to pinpoint breaks, bends, or splices. Pain point solved, Without OTDR, locating a break in a 10 km ... https://jonard.com/fiber-optics/test-equipment