Technicians use various tools to install, maintain, and troubleshoot fiber cabling: detection and verification testers, certification testers, inspection cameras, cleaning supplies, certification testers, and advanced optical time domain reflectometer (OTDR) instruments for. Technicians use various tools to install, maintain, and troubleshoot fiber cabling: detection and verification testers, certification testers, inspection cameras, cleaning supplies, certification testers, and advanced optical time domain reflectometer (OTDR) instruments for. Fiber optic cable is a type of cabling that contains one or more optical fibers for transmitting data at high speeds and/or over long distances using light. These fibers are most commonly made of glass and are very thin, typically less than a tenth of the width of a human hair. Fiber optic cable. In order to perform these tests, the basic fiber optic instruments are the FO power meter, test source, OTDR, optical spectrum analyzer and an inspection microscope. These and some other specialized instruments are described below. Handheld testers and kits for testing optical power, loss, faults, ORL, continuity and polarityThe one-jumper method (Power Meter and Light Source Testing) is highly accurate for measuring signal attenuation (signal loss) across fiber optic cables. Designed for singlemode and multimode applications, fiber testing tools help.