The Rockwell B Scale is a method used to measure the hardness of materials, particularly metals. It employs a specific indenter, typically a 1/16-inch diameter steel ball, which is pressed into the material's surface under a predetermined load. The hardness value is determined by the depth of the indentation left after the load is removed. This scale is part of the broader Rockwell hardness test, which includes various scales for different materials. The Rockwell B Scale is commonly used for softer materials, such as copper alloys and aluminum, providing a quick and reliable assessment of hardness.