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Black Box TS1300A Fiber Optic Power Meter and LED Source Kit high_school|en_CA this case expands up toThe rugged Fiber Optic Power Meter and LED Source Kit from Black Box are designed to precisely measure power loss in fiber optic components under field conditions. The fiber optic power meter and the LED source work together to measure power loss in fiber optic cable, connectors, attenuators, or other passive optical components.