This stud finder features center-find technology for effortlessly locating the center of a stud, with a detection depth of 3/4 inch for both wood and metal. Equipped with AC and live wire detection for enhanced safety, it offers constant auto-calibration to streamline the process and a center marking channel for added convenience. The price drops from $31.03 to $11.97 with free shipping for Prime members or on orders above $35.