The FlexScan® FS200 SM from AFL is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 0.8 m, Attenuation Dead Zone 2.5 m, Optical Wavelength 1310 to 1650 nm, Dynamic Range 32 to 37 dB, Pulse Width 3 ns to 20 µs. More details for FlexScan® FS200 SM can be seen below.