The FTB-7600E from EXFO Inc. is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time 60 minutes, Event Dead Zone 1 m, Attenuation Dead Zone 5 m, Optical Wavelength 1310 to 1625 nm, Dynamic Range 48 to 50.5 dB. More details for FTB-7600E can be seen below.