Which production sampling method involves passing a device uniformly through the material stream?

The correct choice reflects the method known as the Belt Stream sampling technique. This approach is specifically designed for collecting samples from a continuous flow of material, such as aggregate on a conveyor belt. By using a device that passes uniformly through the material stream, the method ensures that the sample is representative of the entire flow. This uniformity is crucial for maintaining the integrity and reliability of the sample, allowing for accurate analysis of the material's properties and composition.

In contrast, the other sampling methods have different characteristics that make them less suitable for producing uniform samples from a continuous stream. Grab sampling collects a single bulk material sample at one point in time, which may not represent the entire flow. Composite sampling involves taking multiple samples from various locations and combining them for testing, which is a more thorough method but does not address the uniformity requirement in the same direct way. Point sampling also targets specific locations for sample collection, but it lacks the systematic approach required for uniformly capturing a continuous flow as seen in the Belt Stream method.