when i say see through, i be a sign of send a pulse or signal that can locate cavity etc.
the reason one we have a enormously old house ans want to find the underground room its supposed to have
ive be told there is a mechanism that surveyors use
Answers:
There are two kinds of machines that can "see" through walls--one is by sonic side, and the other is by x-rays. See your local housing inspection office or hail as a contractor. Short of those two departments, check the Internet.
They now cause small cameras that let you see surrounded by a wall cavity,only superman can see through the wall.
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