Take a look in your wall with the Bosch Truvo. This pipe locator detects current-transporting conduits as well as ferrous materials, such as steel, and non-ferrous materials, such as copper. Depending on the material you're locating, you can detect it to a depth of 5 to 7 centimeters. If the pipe locator detects an object, it gives you an acoustic warning signal. That's not a good place to drill. If you're more of a visual person, the LED shows you where it's safe to drill. In addition, the Truvo has one-button controls, auto-calibration, and soft grip, so you can easily and comfortably inspect your walls.