Secret Purposes Behind Common Items That Will Blow Your Mind

#47: It Measures Itself

Next time you use a tape measure, take a look at the case itself. That chunk of plastic or metal housing the tape isn’t just for storage—it’s also a built-in measurement. Most cases list their own width on the side so you can include it when measuring inside spaces, like windows or cabinets.

This feature saves you from having to bend the tape to reach the other edge, which often leads to inaccurate measurements. Instead, just press the tape into the corner, add the width of the case, and you’ve got a more accurate number. It’s a smart detail for DIYers, builders, or anyone doing home projects.