The FHO5000-D26 from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 1.5 m, Attenuation Dead Zone 8 m, Optical Wavelength 1310 to 1550 nm, Dynamic Range 30 to 32 dB, Pulse Width 3 ns to 20 µs. More details for FHO5000-D26 can be seen below.