The MaxTester 715D from EXFO Inc. is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time User-defined, Event Dead Zone 0.9 m, Attenuation Dead Zone 3.6 m, Optical Wavelength 1310 to 1650 nm, Dynamic Range 30 to 32 dB. More details for MaxTester 715D can be seen below.