Which tools are typically included in a combination set for precise measurements?

A combination set is specifically designed for making precise measurements and typically includes tools that contribute to accuracy and versatility in measurement tasks.

The centering head is particularly useful for locating the center of circular or cylindrical objects, enhancing precision when working with various types of materials. The protractor is utilized for measuring angles accurately, while the square ensures that angles are true and allows for straight cuts, making it essential for laying out projects accurately. These three tools work in tandem to provide a comprehensive approach to precise measurements and layouts in various trades, especially in carpentry and metalworking.

The other options include tools that may serve different purposes or are not focused solely on precision measurements. For instance, hammers and compasses might be used in construction or design but do not provide the specific measurement functions that make the combination set an ideal choice for precision tasks. Thus, the tools in the selected answer are more aligned with the requirements of obtaining precise measurements.