What is the purpose of using a depth gauge during inspections?

Using a depth gauge during inspections serves the specific purpose of checking dent depth. This tool allows inspectors to measure the extent of any dents or deformations in the surfaces of intermodal containers effectively. Accurate measurement is crucial because excessive dents can compromise the structural integrity of a container, potentially leading to safety hazards during transport. By measuring the depth of these dents, inspectors can determine whether the container meets safety standards and can continue to be used without risking leakage or damage to cargo.

Other options, such as punching holes in forms or marking defects, do not relate to the primary function of a depth gauge. Securing container stability also does not involve measuring depth; it pertains more to the proper arrangement and securing of cargo within the container. Thus, focusing on dent depth is central to maintaining safety and compliance during intermodal transport.