Calibrating Tape Measures

All right. My helper here, he's marking a stud I measured at 107 on using my tape measure

But how do we know that his tape measure is gonna do the exact same measurement

Well, guess what? There can be mistakes. Here's why two things, the end of a tape measure can

get bent. If you drop the tape measure, this can get bent in and then it'll give an inaccurate measurement

If my tab is straight and see this right here, this is supposed to slide

If this gets rusted or jammed, it won't slide and give you the correct measurement

taking into account the thickness of the metal. So you have to make sure these are lubricated and you have to make sure the end

of both tape measures are not bent