MULTIPLE MARKERS: StudMark is the only magnet stud finder that comes with 2 removable, magnetic stud markers. Lets you mark up to 3 stud locations [UPDATED 2020] NEW STRONGER MAGNETS FOR HANDS FREE OPERATION: When this quick & easy stud finder locates a stud nail or screw in sheetrock or drywall, it sticks right to the spot, leaving your hands free to work. Due to thickness variations, StudMark is NOT recommended for plaster walls. REDUCE MESSY PENCIL MARKS: since your stud locator & markers attach magnetically to your wall you’ll rarely need a pencil to indicate stud positions COMPACT SIZE: your sturdy new stud finder fits easily in your shirt pocket or nail pouch. Powerful rare earth magnets hold markers securely in place NEVER NEEDS BATTERIES: Reliable and dependable, StudMark has a 2-year covering any defects in workmanship