2. This product can quickly and easily locate wooden metal studs, joists, metal pipe reinforcement and live AC wires behind walls, floors and ceilings. 4. Wide range of adaptation, as long as you want to see the internal situation of opaque objects, you can want to use it. 3. SH402 wall detector can clearly identify what objects are inside the wall, which is more intuitive and accurate. Wood detection, metal detection, current detection. 1.The new 1.5-in-1 design is more powerful, more accurate, and lasts longer.The design of the alarm allows you to always know the situation of the wall, so that the operation is more accurate. 5. Use upgraded internal sensors. It senses changes in the density of the space behind the wall and locates the stud center very accurately., Weight: 0.4519476371 pounds, Manufacturer: Aboiled