Feature: 1. 5 IN 1 STUD FINDER: Used to detect the center position of wooden stems, metal positions, and live wires in wall made of wood or gypsum board materials, and equipped with AC warning function. 2. ALARM DESIGN: The design of the alarm allows you to constantly understand the condition of the wall, making the operation more accurate. 3. QUICK POSITIONING: This stud finder can quickly and easily locate metal studs, joists, metal pipes, steel bars, and live AC wires behind wall, floors, and ceilings. 4. WIDELY USED: Clearly identify which objects are inside the wall, making it more intuitive and accurate. Suitable for wood testing, metal testing, and current testing. 5. ESSENTIAL TOOLS FOR FAMILIES: Convenient, durable, easy to operate, able to sense changes in spatial density behind wall, making it a practical tool for families. Specification: Item Type: Stud Finder Wall Scanner Mode: SH301 Material: ABS Power Supply Method: 1 x 9V dry battery (not included) Measurement Range: Wood Detection: |: 1/2 inches (12.7 mm) II: 1 inch (25.4 mm) III: 1 1/2 inch (38 mm) Metal Detection: 2.36 inches (60 mm) AC Detection: 2 inches (51 mm). Package List: 1 x Tester 1 x Manual