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TDR, OTDR, Multi meter and Environmental Monitor This lesson covers the following tools:
Time domain reflectometer (TDR): device which sends signals and listens to reflections back. TDRs estimate cable length; find cable faults and splices.
Optical time domain reflectometer (OTDR): used for fiber
Multimeter: measures electricity for resistance, current, voltage and continuity.
Environmental monitor: monitors the environment for humidity, temperature and air particles