What about geography of manufacturers, Europe is leading here with a long shot. The most qualitative and interesting samples are made by engineers from Serbia, Switzerland, Italy and so on. Americans are up-and-doing, and they can also boast a number of quite suitable devices that are actively spreading in the market. Surprisingly, our local producers are keeping apace with the whole planet. In issue-related publics you can easily find makers from Russia, whose products enjoy quite the same high demand.