ok Thank you, Peter, a lot! I understand what i will do.
In the list, can you help to choose the good one?I suggest you buy a unit marketed in Europe with CE (preferably med-CE certification). You will find a list of units here:
http://www.rifeforum.com/wiki/R.I.F.E_Machine_Table
My english language is not good and i don't understand this table of data.