301-2 In the phrase ＂tap density tester”, what does tap mean?

The word tap means the process of rising and falling. It neither means vibration nor shaking.
This measurement process is described above. This process imitates a state that being experienced by the powders during the transportation, which is rising and falling. HMKTest is the world most advanced tap density tester producer, which has a large number of customers in the international and domestic.

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