Franklin Sensors ProSensor 710+ Stud Finder with 13-Sensors, Wood & Metal Stud Detector/Wall Scanner, Built-in Bubble LevelNot designed for lath & plaster or non drywall. Needs 2 non rechargeable AA batteries, not included Higher Accuracy, Better Technology: With 13 patented sensors, the 710+ detects studs more accurately Shows FULL WIDTH of Studs: The wide LED display shows the studs center and edges simultaneously Deep Scan 1 3 5", Always On: the 710+ auto adjusts for depth through 1 layer of sheetrock drywall Accurate and Easy: Just press and hold the button to