The FHO1000 from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone <1 m, Attenuation Dead Zone <4 m, Optical Wavelength 1310 to 1550 nm, Dynamic Range 26 to 28 dB, Pulse Width 3 ns to 20 µs. More details for FHO1000 can be seen below.