Or called main wavelength. On the CIE color coordinate, a straight line drawn between the point for a given color and the point for the color of the illuminant can be inferred out so that two points intersects at the perimeter of the space. The point of intersection nearer to the color in question is the dominant wavelength of the color as the wavelength of the pure spectral color at that intersection point.
Dominant Wavelength Diagram (from https://en.wikipedia.org/wiki/Dominant_wavelength)
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Rainbow-Light launched portable full spectrum color measurement instrument (CS-16) for the reflectance measurement, color measurement products by using MEMS manufacturing technology as to has small volume, seismic resistance and portability. This is designed for fast measurement of paper, paint, plastics and textiles color data.