Compact 10-foot tape measure slips easily in a pocket for everyday carry (EDC).
Convenient, intuitive lock mechanism - just grip the side of the tape measure to stop the blade.
Magnetic back allows convenient storage on the side of your refrigerator, table saw, or other steel or cast iron surfaces. You can always have one nearby without it being in the way on horizontal work surfaces.
Wrap the tape around a tube to find the diameter with the diameter scale.