What are the requirements for a sampling template?

The key requirement for a sampling template is that it should be designed to be adjustable between two endplates. This flexibility is vital because it allows the technician to sample aggregates of varying sizes and configurations effectively. An adjustable template ensures that the sampling can be conducted accurately and consistently, accommodating different material types and sizes encountered during testing. The ability to modify the template dimensions enhances the precision of sample collection and ensures that the samples are representative of the material being tested.

The other options, while they may seem relevant, do not encapsulate the primary functional requirement of a sampling template. For instance, while portability may be a desirable feature, it isn't a strict requirement. Similarly, being made of metal or following specific color codes does not directly correlate with the essential purpose of ensuring accurate and reliable sampling.