Read this tip to make your life smarter, better, faster and wiser. LifeTips is the place to go when you need to know about Measuring & Marking and other Tool topics.
Some stud finders require calibration in order to work properly. Some do "instant calibration" and some require you to find a stud-free spot on a wall to perform that stud finder calibration. If you are buying a stud finder from a third party on eBay or from a garage sale, be sure to ask what kind of calibration is needed to make the finder work properly.