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High-Quality Construction: The Singlemode Duplex 50/125m MPO/APC loopback adapter features precision ceramic ferrules to ensure optimal optical performance, minimal insertion loss, and high reliability. Constructed with premium optical cables and connectors, it provides low insertion loss (0.6db) and low return loss (20db), functioning reliably across a broad temperature range of -40 to 75°C. The loopback tester is designed with a protective casing for the fiber optic cable, preventing bending or breakage and improving the adapter's durability during tests. Versatile Applications: Ideal for fiber optic testing, network recovery, and system debugging. This LC connector loopback adapter is perfect for evaluating the performance of fiber optic cabling, SFP modules, equipment ports, or entire network devices