The S2105-P2F1 from Saluki Technology is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 1.2 m, Attenuation Dead Zone 5 m, Optical Wavelength 1650 nm, Dynamic Range 26 dB, Pulse Width 3 ns to 20 µs. More details for S2105-P2F1 can be seen below.