The WF6-200 VIS from HighFinesse is an Optical Wavelength Meter that has a measurement range of 530 nm - 1064 nm. It has an absolute accuracy of 200 MHz and wavelength deviation sensitivity of 8 MHz. This wavelength meter has an exposure time of 3 μs - 3300 μs and a measurement rate of 300 Hz - 24000 Hz. It has a live calculation speed of 24000 Hz and live calculation latency of greater than 33.6 ms - 0.7 ms. This wavelength meter has a Fizeau interferometer with a free spectral range (FSR) of 16 GHz and quick coupling accuracy of 600 MHz.

The WF6-200 VIS is calibrated using a stabilized He-Ne laser or other laser sources with a frequency uncertainty (Δν) of less than 40 MHz. It requires a DC supply voltage of 12 V, minimum input energy of 0.29 nJ (at 532 nm), and consumes 100 µW (at 3 µs) of power. This wavelength meter can be controlled via USB 2.0 or GbE interfaces and is available in thermally insulated package that measures 432 mm x 144 mm x 144 mm. It is ideal for secure quantum communication, tools for high end laser diagnostics, atomic clocks, and quantum computing applications.