What does inside measurement refer to in using calipers?

Inside measurement when using calipers specifically pertains to the process of measuring the internal dimensions or openings of an object. This is accomplished using the inside jaws of the calipers, which are designed to fit within the confines of a hollowed space or a gap, allowing for precise measurement of the internal width, diameter, or depth. This function is critical in various applications, such as mechanical engineering and manufacturing, where accurate internal dimensions are vital for ensuring proper fit and functionality of components.

The other options highlight different measurement functions. Measuring the external dimensions involves using the outside jaws of the calipers, while weight measurement is entirely unrelated to calipers as they are not designed for weighing objects. Measuring angles requires specific tools such as protractors or angle finders, which are distinct from the purpose and design of calipers. Thus, the focus on measuring internal dimensions clearly identifies option B as the correct response.