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.
How Can I Get Better Results From My Tape Measure?
One of the best things you can do to help yourself
when using a tape measure involves properly marking the surface you are
measuring. Instead of making a straight line, it is far easier to make
a "v" mark on the wood, paper, or other surface you are working
with. The point of the "v" helps you to quickly locate your
measurements and cut, hammer, or drill in exactly the right spot.
Why Use A Laser Level?
If you are in the beginning stages of your tool collection for drywall
hanging, home improvements, or other do-it-yourself projects, consider
adding a laser level to your kit sooner rather than later. If you are
new to laser levels, the first thing you’ll most likely encounter
is a choice between a self-leveling laser and models sold without that
feature. Spend the extra money for a self-leveling laser, as they will
reduce the headaches you’ll get trying to use the “bubble”
to adjust and set the level for your new tool. Any bump or jostle to a
standard laser level can knock your measurements out of whack. There is
no danger of this with a self-leveling laser product. Just turn it on,
and get to work. It’s that easy.