A volt/ohm meter, commonly referred to as a multimeter or multitester, is an electronic measuring device that integrates multiple measurement capabilities into a single unit.
A standard multimeter might have capabilities to measure voltage, current, and resistance, among other things. A tool called an optical time domain reflectometer (OTDR) is used to construct, certify, maintain, and troubleshoot fiber optic networks. It checks the integrity of a fiber cable. A twisted pair Ethernet cable called an Ethernet crossover is used to directly connect computing devices that would typically be connected through a network switch, Ethernet hub, or router, such as by connecting two personal computers together using their network adapters.
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