The MW90010B from Anritsu Corporation is a Optical Time Domain Reflectometer (OTDR) with OTDR Measurement Time 15 minutes, Optical Wavelength 1527.60 to 1567.13 nm, Dynamic Range >18 dB, Pulse Width 3 to 100 µs, Distance Range 1000 to 20000 km. More details for MW90010B can be seen below.