What is the purpose of the indicating band on the working end of an insertion tool?

The indicating band on the working end of an insertion tool serves a specific function related to the tool's usage. Its primary purpose is to determine the correct depth to insert the tool into a particular application. When the tool is being used, the indicating band provides a visual reference that helps ensure the user knows how deep the tool needs to be inserted to achieve the desired outcome. This is crucial for maintaining precision and effectiveness during the insertion process, as inserting the tool to the correct depth is essential for optimal performance and to avoid potential damage or failure of the component being worked on.

The other options, while they might seem plausible, do not align with the primary function of the indicating band. It is not designed to measure length, identify different tools, or indicate the tool's brand, as these functions are typically served by other features or markings on the tool.