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The 521-VIS from Bristol Instruments is a Optical Wavelength Meter with Wavelength Range 400 to 1100 nm. More details for 521-VIS can be seen below.
50 to 950 µW, VIS to MIR Range Optical Wavelength Meter
Fast & Reliable Laser Wavelength Meter for measuring wavelengths of Pulse/CW Lasers
Accurate, Reliable, and Fastest multi-wavelength meter for WDM test applications.