Abstract: An ergonomic hand-held device is provided to allow a user to easily apply the necessary force required to install a caps into a vial or test tube. The device includes a handle member that is ergonomically shaped to provide a user with maximum comfort while minimizing any physical problems associated with the use of the hands and wrists continuously in a repetitive motion. The device also includes an engaging projecting member that extends from the handle member. The projecting member includes a flat surface at one end such that when engagement with the cap the flat surface lies substantially flush against a bottom wall of a cavity of the cap. Through this configuration, a user generated force is transferred from the handle member through the projecting member, and to the cap, thereby causing the cap into an opening of the vial for locking the cap into a sealed and closed position with the vial.