RS 820 is just like the simplified OTDR, It’s 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, RS 820 Fiber Ranger is an excellent essential instrument for installation, construction and maintenance of the optical fiber networks.