If you have ever pounded a nail into a wall and suddenly seen sparks, then you know the dangers of hidden electrical lines when you are hanging pictures or mounting a shelf. Also, you may have ruptured a pipe with a nail and found yourself getting an unwanted shower. Those mistakes could be over with the Walabot. This handy device lets you see into walls before you nail or drill. Our Walabot review will show all the capabilities of this device. Even if you have concrete walls, the manufacturer says it can tell you what is hiding behind there. It is designed to work on drywall too. And though floors don’t tend to have as much beneath them, you can check to see what is down there before you start making holes.