A device 20 for location and identification of pipes, conduits, cables or buried or hidden objects 8 is described without the need of any invasive and/or destructive work, said device comprising at least one transponder 1 utilizing RFID or like technology for identification without any physical contact or line-of-sight, said transponder 1 being attached in a support 7 shaped as a mesh, tape, wire, cable, cordage or alternatively in a device 32/33 such as a bar, tappet, line, stud, mushroom, pipe, marker or the like, device 20 resulting from the combination of 1 and 7 or of 1 and 32/33. A system for location and identification of said objects 8 comprises said device 20 and further a reading and/or writing unit 3 of the information on said pipe, conduit, cable or buried or hidden object 8, at least an antenna 2 besides said pipe, conduit, cable or buried or hidden object 8. Also described is the method for installing device 20, the method for location and identification of a pipe, conduit, cable or buried or hidden object 8, as well as the method for mapping and execution of as-built plants of pipes, conduits, cable or buried or hidden objects 8 without the need of any invasive and/or destructive work.