The AQ6331 is Ando's new portable Optical Spectrum Analyzer offers the advanced performance required for 50 GHz DWDM network testing, in both C-band and L-band.The AQ6331 has excellent wavelength resolution, as well as accuracy and dynamic range which are equal to conventional bench-top OSAs used for research and development applications.Thanks to its unique rugged design, as well as being portable, the AQ6331 is an ideal tool for field applications such as construction, inspection and maintenance work. It can also be used in production and quality control processes (e.g. component test and measurement).The AQ6331 is the only portable OSA to bring scientific specifications into field applications. Features Approximately 10kg Wavelength accuracy:±0.02nm(1520-1580nm) ±0.05nm(1580-1620nm) Wavelength resolution:0.05nm minimum Dynamic range:55dB (peak ±0.4 nm) 40 dB (peak ±0.2 nm) Internal wavelength calibration with built-in wavelength reference One-key operation with built-in user programming function Unique long-term measurement function to monitor DWDM systems stability and performance Various built-in analysis functions Our Ando AQ6331 Optical Spectrum Analyzer boots up, performs self calibration, and reports no errors. Main program version: R01.02 Sub-CPU version: R01.04 Printer works, unit appears to be in excellent condition.