FO86309 Fiber Optical Cable Fault Locator is just like the simplified OTDR. This cable fault locator is designed for the identification of fault locations (distance from the fiber-start point) and fault types (i.e. reflection or attenuation). With features of quick response, portable size, easy to use, large and comfortable LCD with adjustable brightness of backlight, data storage with USB communication port and power-saving design, the Fiber Ranger is an excellent essential instrument for installation, construction and maintenance of the optical fiber networks.