Answer :
Final answer:
The correct measuring tool for measuring the free movement of a part is the dial indicator, due to its ability to detect very small increments of movement and provide precise readings.
Explanation:
The measuring tool used to measure the distance in which a part can move freely is the dial indicator. A dial indicator is designed to measure small distances and minute displacements, which are often not possible to measure with standard tools like rulers or tape measures.
Although a ruler can measure to the nearest millimeter, a dial indicator is more suitable for measuring free movement or play in mechanical parts because it can detect very small increments of movement and provide precise readings. Tools like the inside micrometer, vernier caliper, and ruler have their specific uses but measuring free movement is typically the domain of a dial indicator due to its sensitivity and precision.
