What is the black diamond on a tape measure for?

The black diamond on a tape measure is typically used as a reference point for measuring from the opposite end of the tape. It is positioned at a specific point along the length of the tape measure and is often located at the 19.2-inch mark on a standard 25-foot tape measure.

The black diamond is commonly used in construction and carpentry applications as a quick and easy way to measure and mark intervals without having to read the measurements on the tape measure. By aligning the black diamond with a reference point on the material being measured, users can make accurate measurements with precision and efficiency.

Overall, the black diamond on a tape measure serves as a useful tool for professionals and DIY enthusiasts who require precise and consistent measurements in their projects.