The concrete slump test is a very simple procedure to measure the workability of fresh concrete. Because it involves low-cost tools and can be quickly done in situ, it is used extensively on most construction sites. By measuring the consistency of fresh concrete before it sets, this test can indicate improperly mixed material.
TBT SCIETECH's TBTSCT-1 will meet your test requirement.
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http://www.tbt-scietech.com/product/414-concrete-slump-testing-apparatus--tly-1---b9ff/