Five working modes designed for versatile detection 1/2 inch stud scan mode: detects wood or metal studs up to 13 mm deep. 1 inch stud scan mode: detects wood or metal studs up to 25 mm deep. 1 1/2 inch stud scan mode: detects wood or metal studs up to 38 mm deep. Metal mode: for locating steel bars, metal keels, metal pipes, and other metal objects in walls. AC mode: for detecting electrical wiring behind walls. Metal Scan Mode details Primarily used to detect steel bars, metal keels, metal pipes, and similar metal structures within walls. Magnetic metal detection depth: up to 3.2 inches (80 mm) for a 15 mm diameter galvanized steel tube. Nonmagnetic metal detection depth: up to 2.4 inches (60 mm) for a 13 mm diameter copper tube. Three Stud Scan Modes overview 1/2 inch stud scan mode: detects wood or metal studs up to 13 mm deep. 1 inch stud scan mode: detects wood or metal studs up to 25 mm deep. 1 1/2 inch stud scan mode: detects wood or metal studs up to 38 mm deep. LCD Display and user feedback Backlit LCD display provides clear visual feedback. As the scanner approaches a stud, the indicator bar rises and the percentage increases. When the center of a stud is located, the indicator bar is full and the buzzer sounds continuously. The display shows additional indicators including signal bar, center indication, metal depth indication, and current mode.