Whether you’re hanging a picture,mounting a TV,renovating part of your home, or working as a professional contractor, you need to know what is on the other side .Tavool stud finder is one of those tools that you will eventually need. Tavool stud finder can be the difference between a successful DIY home project and a bad one. The wall detector features large LCD display, ergonomic design and multi-sense technology for accurate detection of both metal and wooden studs. It will also detect live wiring up to two inches into walls. The four scanning modes (stud scan, deep scan, metal scan and AC scan) make it ideal for both tradesmen and home carpenters. With this device, you can immediately find a suitable place on the wall without making any extra holes Tavool stud beam finder is a device that is used to determine exact location of framing studs that are located behind the drywall. This Multi-scanner stud finder uses electronic signals to quickly locate edges and center of metal, studs, joists, pipes, live AC wire behind walls, floors and ceilings. The cost of a stud finder wall scanner will almost always be less than the cost of repairing the damage done from not locating one before hanging something. TAKE IT HOME AND START YOUR PROJECT ! Note: 1. This stud finder can quickly locate metal, studs, joists, pipes, live AC wire behind all kinds of walls floors and ceilings but except the cement board wall and brick wall, you can use it on popcorn ceilings, plaster walls, textured surfaces, drywall, etc. 2. Please note: The 9v battery is not included in the package