What type of inspection does a feeler gauge assist with?

A feeler gauge is an instrument primarily utilized to measure gaps or clearances between parts, making it particularly effective in assessing flooring gaps in containers. This tool consists of a series of thin metal strips of varying thickness, which can be inserted into small openings to determine the precise space between two surfaces. When inspecting intermodal dry cargo containers, ensuring that there are no undue gaps in the flooring is crucial since gaps can lead to potential cargo damage or safety hazards during transport.

In this context, measuring flooring gaps helps certifiers verify that the structural integrity and safety of the container are maintained. This is especially important because the flooring must support the cargo and prevent any movement that could result in damage.

While checking dent depth, marking defects, and cleaning dirt are all aspects of container inspection, they do not fundamentally involve the specific purpose and functionality of a feeler gauge. Hence, the correct focus on measuring gaps highlights the tool's design and intent in maintaining container condition and cargo safety.