The FHO3000-SA30F from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 1 m, Attenuation Dead Zone 6 m, Optical Wavelength 1650 nm, Dynamic Range 30 dB, Pulse Width 3 ns to 20 µs. More details for FHO3000-SA30F can be seen below.