The MS9740A from Anritsu Corporation is a Optical Spectrum Analyzer with Wavelength Range 600 nm to 1750 nm, Wavelength Resolution 0.03, 0.05, 0.07, 0.1, 0.2, 0.5, 1.0 nm, Wavelength Accuracy ±20 to ±100 pm, Dynamic Range 58 to 60 dB, Sweep Time 0.2 to 0.3 sec. More details for MS9740A can be seen below.