Franklin ProSensor T62 Stud Finder is a quick and easy way to find studs in walls. It instantly finds studs, no calibration required, and displays stud center and edges simultaneously. It detects wood and metal, and is accurate and deep sensing. It has 6 precision sensors, always on deep scanning, and multi-sense technology. It requires 2 AAA batteries (notincluded). It has a 1-year warranty.