The FTBx-750C from EXFO Inc. is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time 60 minutes, Event Dead Zone 0.5 m, Attenuation Dead Zone 2.5 m, Optical Wavelength 1310 to 1625 nm, Dynamic Range 45 to 46 dB. More details for FTBx-750C can be seen below.