GAOTek OTDR with Wide Dynamic Range (Short Event Dead Zone) is a high performance multifunctional test instrument which measures physical characteristics such as length, transmission loss, splice loss, etc. of optical fibers and cables in a wide dynamic range. It also can exactly locate the faults or breaks in fiber circuits. This instrument has extra-short event dead zone, which is suitable for testing short optical fiber and pigtail optical fiber. It has 4 optical ports to realize the optical power meter, VFL and single mode & multimode testing functions.