The Tap Density Apparatus is a laboratory instrument used to determine the tapped density and bulk density of powders and granules. It operates by mechanically tapping a graduated cylinder containing the sample at a fixed height and rate until the volume becomes constant. This test helps evaluate powder flow properties and compressibility, which are critical parameters in pharmaceutical, chemical, food, and material science industries. With a digital tap counter, adjustable stroke settings, and stable operation, the apparatus ensures reliable and repeatable measurements for quality control and research applications.