The FTBx from EXFO Inc. is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time <3 seconds, Event Dead Zone 0.7 m, Attenuation Dead Zone 3.5 m, Optical Wavelength 1527.99 to 1567.95 nm, Dynamic Range 40 dB. More details for FTBx can be seen below.