Final answer:
A feeler gauge is the tool designed to measure small clearances or gaps between parts, essential for obtaining precise measurements.
Step-by-step explanation:
The tool that measures small clearances or gaps between parts is called a feeler gauge. This tool consists of a set of thin metal strips of varying thicknesses, which can be used to measure gaps that are often too small to be measured by other tools. It is important for the precision of measurements that the appropriate tool is used for the task at hand. For example, while a micrometer can measure to the nearest 0.005 millimeter and is suitable for determining the thickness of small parts, a feeler gauge is specifically designed to measure gap widths by inserting its blades into the space to be measured.