The MaxTester 720C from EXFO Inc. is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time User-defined, Event Dead Zone SM: 0.7 m, MM: 0.5 m, Attenuation Dead Zone SM: 3 m, MM: 2.5 m, Optical Wavelength 850 to 1625 nm, Dynamic Range 27 to 36 dB. More details for MaxTester 720C can be seen below.