or pipe wall in the illustrated embodiment an electrically conductive disk 925 obviously an electrically conductive object is utilized in conjunction with the flux generator 500 the flux generator is comprised of a transmitter coil 300 alternating power supply 585 connected to the transmitter coil by means not shown amp meter not shown four 4 saturation flux generating coils 552 wrapped around saturation cores not shown a magnetic culminator 555 and two poles 504 and 505 of like polarity and having polarity opposite that of the culminator 555 it will be appreciated that the culminator saturation flux cores and poles are comprised of highly magnetically permeable material the saturation flux generator is located proximate to the side 129 of the wall opposite the remote electrically conductive disk 925 in a preferred embodiment both the disk 925 and culminator 555 have substantially the same center axis c l accordingly the space 955 may be minimal or non existent the saturation flux generator can be powered by a dc power source or low frequency ac power source not shown the magnetic flux emitted from culminator 555 and magnetic poles 504 and 505 are used to create a metallic transparency u2122 within a portion of the wall 128 the transparency will permeate through the thickness 127 of the wall 128 in conjunction with the creation of this transparency the transmitter coil is energized with ac power or pulsed dc power that will create an oscillating or variable magnetic flux to be emitted from the side of.