What must a dipper be to ensure an accurate sample regardless of the type of sample?

A dipper must be clean and free from fat to ensure an accurate sample, as any contamination can compromise the integrity of the sample being collected. If the dipper has any residues or contaminants, especially from previous uses, this can alter the composition of the sample, leading to erroneous results. Cleanliness is fundamental in sampling procedures to maintain the purity of the collected material.

While other choices may appear beneficial in certain contexts—such as being made of stainless steel for durability, flexible and adjustable for accessing different container sizes, or heavy for stability—none address the critical necessity for the dipper to be uncontaminated. Cleanliness is paramount in achieving reliable and trustworthy sampling results, making it the essential attribute for a dipper used in this process.