A master reference gauge is primarily used for which purpose?

A master reference gauge is mainly utilized for checking the working gauge for accuracy. Its primary function is to serve as a benchmark against which other measuring instruments or gauges can be tested. When performing calibration or verifying the precision of other gauges, the master reference gauge provides a known standard, ensuring that other instruments are reading correctly and within acceptable tolerances.

This process is crucial in maintaining quality control, as accurate measurements are fundamental in various industries. The master reference gauge essentially acts as a trusted reference point to ensure the reliability and accuracy of measurements taken by other devices.

The other options, while they relate to measurement in different capacities, do not align with the specific purpose of a master reference gauge. Measuring temperature, calibrating sensors, and assessing electrical resistance are tasks typically performed by specialized instruments designed specifically for those functions rather than by a master reference gauge.