What is the odd leg for in a pair of odd leg callipers?

The odd leg in a pair of odd leg calipers is used primarily for marking out or transferring measurements, particularly when needing to establish distances from a reference point. Unlike the standard legs, one leg is pointed while the other has a flat surface, allowing for easy alignment and marking on materials. This design aids in precision work, such as scribing lines or measuring between two points. Overall, the odd leg enhances versatility in various marking and measuring tasks.