Final answer:
The Acme tool is aligned with an Acme tool gage, which is specifically designed for accuracy in aligning thread cutting or machining tools. For general measurements, a ruler is adequate, but specialized tasks require dedicated gages.
Step-by-step explanation:
The Acme tool is most suitably aligned using an Acme tool gage. When matching a tool with the unit to measure an object, one must consider the appropriate scale and precision. For general measurements in inches, centimeters, or millimeters, the ruler is the most common tool used, as it provides a direct way to measure length or distance. However, when aligning tools for specific tasks such as thread cutting or machining, dedicated gages related to that tool set become essential for accuracy. For example, working with an Acme screw thread would require specifically designed tools and gages, such as an Acme tool gage, to ensure precision alignment.