Ryobi Stud Finder Multiple Leds To Indicate The Full Width Of The Stud.Ryobi Stud Finder Multiple Leds To Indicate The Full Width Of The Stud. Product Features Wood and metal material detection Multiple LED's light up to indicate the full width of the stud Easy to use one handed operation Built in stud marker to conveniently mark the center of the stud Auto Depth Scan Technology is designed to determine the thickness of the wall up to 1 1 2 in. thick. 2 AAA Batteries conveniently included Description The RYOBI Whole Stud