This one is used for testing purpose

Slump Cone

A slump cone is a cone-shaped metal or plastic container used to test the consistency of fresh concrete. It is used to determine the "slump," or flowability, of the concrete, which is an indication of its workability and suitability for a particular application.

Slump cone testing is an important quality control measure in the construction industry, as it allows engineers and contractors to ensure that the concrete used in a project meets the required consistency and workability specifications.