Zircon 58050 StudSensor Pro Deep Scanning Electronic Stud/Joist Locator Scans through non-metallic wall surfaces DeepScan mode for extra-thick surfaces up to 1-1/2" of drywall, plywood, paneling, or bare wood flooring Find edges of both wood and metal studs Hang pictures, mirrors, and shelves securely Patented TruCal instant calibration