Hematocrit Centrifuge Machines (HCM) apply centrifugal force to separate suspended particles from a liquid or liquids which have different densities. Centrifuges of which the forces are greater than gravity can greatly accelerate separations that occur naturally as a result of density differences. HCM were intended to separate red blood cells from plasma in order to facilitate later diagnosis process. Main components include a motor that supplies power to the disk to quickly attain required speed. An unbalance found on a disk which creates vibration on the structure of HCM was caused by either non-homogeneous material or manufacturing process. Therefore, to balance the disk, this paper presents the analysis and design of the Vertical Balancing Device (VBD) for HCM using inexpensive accelerometer to measure amplitude with Hall-effect sensor to estimate rotating speed and maximum phase trigger for balancing. The experimental results show that VBD can balance the disk which in turn effectively reduces vibration to the determined dynamic response criteria effectively of unbalance vibration.