Meet the Walabot: an app-enabled gadget that combines with your smartphone to let you see through things. It shows you plastic & metal pipes, wires, and other important parts. It also shows you the depth of cement. The device can also detect rodents moving behind your walls.
More gadgets like this: here
Walabot DIY
The Walabot features adjustable sensitivity. It supports a wide variety of Android phones. More info is available here.
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