A tape measure comes with several markings that some may not know, like the black diamonds. Here's what those symbols mean and how you can use them.

If you've ever wondered what the black diamonds on a tape measure are for then you're not alone - and people have taken to the internet to find out.

The black diamonds aren't there for decoration ... and are instrumental in facilitating efficient work. These marks on your tape measure also referred to as 'joist marks', correspond to the ...