6. The sensor is located near the marking hole to locate the center target to ensure detection accuracy. 7. Purpose: Quickly locate wood, metal and AC wires hidden in the walls, floors and ceilings of houses. It can work on slats, wallpaper, wooden floors, soundproof ceilings, painted walls, etc. The multifunctional wall scanner HW430 has five scanning modes: Stud 0.5 in. Scan: locates the center and edges of wood and metal studs up to 0.5 in. (13mm) Deep stud 1 in. Scan: Locates centers and edges of wood and metal studs up to 1 in. (25mm) Deep studs 1.5 in. Scan: Locate up to 1.5in. centers and edges of wood and metal studs. (38mm) deep metal. Scan: Detects metal exchanges up to 2.36 in. (60mm) deep. Scan: Detects live unshielded AC wires up to 2 inches (51mm) deep. Specification: Name: 5 in 1 Stud Detector Color: Black, Yellow Battery: 9V battery (without battery) Battery model: 9v battery 6F22 Certification: CE Size: 152*62*28mm/5.98*2.44*1.1in Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. 1 X Wall Stud Detector