The AQ7293F from Yokogawa Test & Measurement Corporation is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time 3 minutes, Event Dead Zone 0.5 m, Attenuation Dead Zone 2.5 to 3.5 m, Optical Wavelength 1310 to 1650 nm, Dynamic Range 40 to 43 dB. More details for AQ7293F can be seen below.