Watch YouTuber Tom Hintz from the website NewWoodworker.com as he explains the markings on your tape measure.
Things like Black Diamonds, those small black diamonds, or triangles (diamonds are more commonly found), on the top scale of the tape measure starting at 19.2 inches are for truss layouts for 8-foot sheet goods. They are also known as the “black truss” markings.
Then there are red numbers. As you extend the tape measure, you’ll probably see the numbers 16, 32, 48, 64, 80, 96 and so forth in red. The red indicates 16-inch-on-center spacing. This is a common framing spacing for wall studs, floor joists and common roof rafters.
And Tom knows even more. He’s a tape expert!