Multimeter, Measures voltage, amperage, and resistance. Zero ohms indicates proper grounding, Voltmeter, Voltage only, Loopback Plug:, test a port.  Should result in a solid connection LED, Tone Generator and Probe:, sends repeating signal.  Used for cable identification, Fiber Optic Cable, Contains glass fiber strands. Designed for long-distance, high-performance networking, Shielded and plenum copper cables limited to, around 100 meters, Coaxial cables cover, 200 to 500 meters at most.

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