Which tool helps ensure accurate measurements when marking holes in an assembly?

The decimal scale is specifically designed for precise measurements and is particularly useful in scenarios where accuracy is crucial, such as marking holes in an assembly. It allows for measurements to be read in a decimal format, which can provide a higher level of detail than fractional measurements. This precision is essential in aerospace assembly, where even minor discrepancies can lead to significant issues.

For instance, when marking holes for bolts or other fasteners, ensuring that the measurements are exact is vital for maintaining the integrity and safety of the assembly. The decimal scale can help avoid errors that might arise from estimation or interpretation of measurements, which is critical in achieving the exact tolerances required in aerospace applications.