P.I.P. Roller Mixer has 6 rollers for mixing blood specimens, high viscosity samples, suspensions, etc. One of the functional properties of this device is its simultaneous rotational and vertical motion of the rollers. The roller dimensions and the distances between them make the instrument usable with different tubes and cylindrical bottles. A washable protective tray is designed under the rollers in order for easy cleaning in case of sample spillage. P.I.P. Roller Mixer is resistant to most of the common laboratory acids and chemicals.