Red Seal Tool and Die Maker Practice Exam

What type of inspection tool is used to measure inside diameters?

1. A caliper

2. A gauge block

3. An outside micrometer

4. An inside micrometer or caliper

The correct answer is: An inside micrometer or caliper

An inside micrometer or caliper is specifically designed to measure the inside diameters of holes, cylinders, or other internal features. This type of tool typically has a specialized design that allows it to expand into an internal space, providing precise measurements of the diameter at various points. Inside micrometers often use interchangeable heads or rods to accommodate different sizes, ensuring accuracy across a range of internal measurements. On the other hand, a caliper, while versatile, does not always provide the same level of precision as an inside micrometer when it comes to measuring inside diameters, especially for smaller or more intricate spaces. Gauge blocks are used primarily for setting measurements and calibrating other tools rather than direct measurement of internal dimensions. An outside micrometer is designed for measuring external dimensions and is not suitable for assessing inside diameters. Thus, the inside micrometer or caliper is the most appropriate choice for this task.