The S2106S-F1 from Saluki Technology is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 2.5 m, Attenuation Dead Zone 8 m, Optical Wavelength 1310 nm, Dynamic Range 26 dB, Pulse Width 3 ns to 20 µs. More details for S2106S-F1 can be seen below.