Question

which of the following is used to validate a dial bore gage?
calibrated micrometer
calibrated rule
lab block
feeler gages

Explanation:

A calibrated micrometer is a precise measuring instrument used to measure small dimensions accurately. It can be used to validate the accuracy of a dial bore gage as it has high - precision measurements for comparison. A calibrated rule is less precise for validating a dial bore gage. Lab blocks are mainly for setting up workpieces and not for validating gages. Feeler gages measure gaps and not suitable for validating a dial bore gage.

Answer:

Calibrated Micrometer