In 2001, A C Nielsen itself was acquired by VNU, as part of VNU's Marketing Information group, and thus is now under the same corporate umbrella as the company it spawned, NMR.
ACNielsen is also a sister company to Nielsen//NetRatings, which measures Internet and digital media audiences.
Nielsen Marketing Research is the larger part of the company, providing a variety of standard market analysis reports and engaging in other market research.
In 1973 Nielsen began using the Storage Instantaneous Audimeter, a new and more sophisticated design for the same purposes as the original (surely not the only modification over the years, this one was much publicized).
While the Audimeter, widely known as the Nielsen fl box, was their most famous device, it was used only for household television ratings.
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