Which tool is commonly used to check the accuracy of a micrometer?

A gauge block is often utilized to check the accuracy of a micrometer due to its precision and the ability to provide a reference standard. Gauge blocks are manufactured to exact dimensions and are used to calibrate measuring tools, ensuring that the micrometer’s readings are correct. When you measure the gauge block with the micrometer, the reading should match the known dimension of the block.

Using gauge blocks offers high precision, which is crucial in settings where accuracy is paramount, such as in engineering and manufacturing processes. They can also be stacked to create different measurements if necessary, adding versatility for various calibration scenarios.

While the other tools mentioned may have their own uses in measurement and inspection, they are not specifically designed to calibrate or verify the accuracy of a micrometer as effectively as a gauge block does. For instance, calipers and Vernier scales measure external dimensions but do not provide the absolute precision required for checking micrometer accuracy, and a dial indicator is primarily used for measuring displacement rather than direct micrometer calibration.