Amazingly, 18 years after the commercialization of inductively coupled plasma mass spectrometry (ICP-MS), less than 4000 systems have been installed worldwide. If you compare this number with another rapid multielement technique, inductively coupled plasma optical emission spectrometry (ICP-OES), first commercialized in 1974, the difference is quite significant. In 1992, 18 years after ICP-OES was introduced, more than 9000 units had been sold, and if you compare it with the same time period that ICP-MS has been available, the difference is even more dramatic.