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This 2pack of 12core MPO/UPC female fiber loopback testers adopts OM3 multimode 50/125m fiber, designed for 40G and 100G highspeed network testing and QSFP module validation. It provides accurate optical signal loopback to inspect port connectivity, hardware performance and system stability. Compact and durable, these testers are essential tools for data center maintenance, enterprise network deployment and optical communication engineering.