The FHO5000-T40/T40F from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 1.75 m, Attenuation Dead Zone 11 m, Optical Wavelength 1310 to 1625 nm, Dynamic Range 38 to 40 dB, Pulse Width 3 ns to 20 µs. More details for FHO5000-T40/T40F can be seen below.