The TFP2A from Tektronix is a Optical Time Domain Reflectometer (OTDR) with Event Dead Zone 0.2 to 25 m, Attenuation Dead Zone 2.5 to 170 m, Optical Wavelength 850 to 1550 nm, Dynamic Range 26 to 37.5 dB, DC Voltage 10 to 16 VDC. More details for TFP2A can be seen below.