The FHO3000-D35 from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 1 m, Attenuation Dead Zone 5 m, Optical Wavelength 1310 to 1550 nm, Dynamic Range 33 to 35 dB, Pulse Width 3 ns to 20 µs. More details for FHO3000-D35 can be seen below.