The loose metal tip on a measuring tape may seem like a flaw, but it’s actually an intentional and clever design. That tiny bit of movement about 1/16 of an inch (1.5 mm) allows for automatic adjustment depending on whether you’re measuring the inside or outside of an object. It’s a detail that helps ensure accurate results without the user needing to do any math.

When you’re measuring the outside of something, like the length of a table, the tip pushes in to account for its own thickness. When measuring an inside space, like the width of a drawer, the tip pulls out slightly, again adjusting automatically so the measurement stays precise. This means no second-guessing or manual corrections are needed.

To get the most accurate results, it’s important to use the measuring tape correctly. Hook the tip over an edge when measuring the outside of an object and press it into corners for inside measurements. Also, make sure the tape remains straight and clean during use to maintain accuracy.

That small wobble at the tip might seem insignificant, but it plays a big role in getting exact numbers. Next time you use a measuring tape, remember that little movement is the reason your measurements are right on target.