Which tool is used to check the head height after installing a ground stud?

The feeler gauge is specifically designed to measure gaps and clearances between parts, making it ideal for checking the head height of a ground stud after installation. In aerospace assembly, ensuring proper spacing and alignment is critical to the integrity and performance of components. The feeler gauge allows for precise measurement in situations where standard measurements may not be adequate, such as verifying the height of fasteners or fittings against specified tolerances.

Other tools like tape measures, calipers, and micrometers serve different purposes. A tape measure is typically used for longer measurements and isn't as precise for small gaps. Calipers can measure internal and external dimensions as well as depths but may not provide the same level of precision in measuring small gaps as a feeler gauge. A micrometer is used for very precise measurements but is more suited for measuring thickness and diameters rather than the functional gap or height needed in this scenario. Thus, the feeler gauge is the most suitable tool for measuring head height in this context.