Answer :
Final answer:
The correct option is b. Comparison The dial indicator is an independent measuring device which measures displacement directly and is not used for comparison like a steel rule or a micrometer. Factors contributing to measurement uncertainty include the device's limitations and the measurer's skill. Precision in measuring devices is indicated by the number of digits they can report.
Explanation:
The dial indicator is not a comparison measuring device like the steel rule, caliper, or the micrometer. Comparison measuring devices are typically used to compare the size of an object to a reference or standard, or to compare two objects to each other. On the other hand, a dial indicator measures the deflection or displacement directly, and thus it is considered an independent measuring device. It presents the measurement on its own and does not require a reference piece or a known standard for comparison.
When measuring precision, it is critical to consider factors contributing to measurement uncertainty. These typically include the limitations of the measuring device and the skill of the person making the measurement. A more precise measuring device will report more digits, as seen in Figure 1.8.1, where a ruler with millimeter markings can measure up to three digits compared to two digits with centimeter markings.Unlike the other measuring devices mentioned, the dial indicator does not rely on comparison with a standard or known measurement. Instead, it measures the distance by the movement of a needle across a dial.
