The S2106S-S2 from Saluki Technology is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 2.5 m, Attenuation Dead Zone 8 m, Optical Wavelength 1550 nm, Dynamic Range 24 dB, Pulse Width 3 ns to 20 µs. More details for S2106S-S2 can be seen below.