The FHO3000-D26-A from Grandway Telecom is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 3 m, Attenuation Dead Zone 8 m, Optical Wavelength 1310 to 1550 nm, Dynamic Range 24 to 26 dB, Pulse Width 3 ns to 20 µs. More details for FHO3000-D26-A can be seen below.