Final answer:
The Rockwell hardness test is known for using both a minor and major load to measure the hardness of materials, by noting the difference in indentation depth under these two loads.
Step-by-step explanation:
The family of hardness tests that uses both a minor and major load is called the Rockwell hardness test. The Rockwell test measures hardness by first applying a minor load to establish a zero reference position, then a major load is applied to attain the hardness measurement. The difference in depth between the zero reference position and the indentation after the application of the major load is used to calculate the Rockwell hardness number.