Which tool is used to check dimensional tolerances and alignment of containers?

The tool that is best suited for checking dimensional tolerances and alignment of containers is a measuring tape. It is designed for measuring lengths, widths, and heights accurately, which is crucial in ensuring that containers meet specific regulatory standards and fit correctly during intermodal transport.

Measuring tapes come in various lengths and are flexible, making them useful for measuring the physical dimensions of containers in situations where fixed tools may not reach. They allow for quick and straightforward measurement of the container's dimensions, which is essential in assessing whether the container adheres to the required size specifications.

In contrast, while other tools like the welder's hammer might be useful for specific tasks related to container integrity, they do not provide the necessary precision for checking dimensional tolerances. A long straight edge can help in determining flatness or alignment, but it is not primarily intended for measuring dimensions. An adjustable wrench is typically used for gripping and turning nuts and bolts rather than for measuring.

Therefore, the measuring tape is the most effective and practical choice for checking the dimensional tolerances and alignment of containers in intermodal transport.