Manufacturers know that the samples have no influence on the operation of LRL.
I am convinced that they know because in old LRLs there are samples comprised inside glass ampoule. A piece of gold or silver foil is visible. This view affects well fools who think that if there is gold or silver in the ampoule, the LRL will detect gold or silver.
While the foil is cheap because it contains very little metal, it still costs money. Recently LRLs come complete with samples sealed in opaque ampoules. My friends have ever broken one such ampoule. Inside they found bundle resistors connected in series and in parallel without any sense of it. This misleading can be made by people who know that this is nonsense.
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