Abstract: The present invention is a device for measuring and displaying the speed, force, rate and/or frequency that an object or a body part strikes a target. The present invention includes an impact sensor, transmitter, computer and display. The sensor includes layers of alternating conductive and non-conductive material that are wrapped around the target. The conductive layers of fabric generate electrical impulses when they come into contact with each other through perforations in the non-conductive material. These signals are interpreted by the computer to derive information about the speed of the strike against the target.

Abstract: Systems, methods, and apparatus are disclosed for retaining a fastening element in a retention tool. The retention tool may include a housing that includes a socket configured to receive fastening elements. The retention tool may further include a torque restrictor that is coupled to the housing, and is configured to transfer a rotational force to the fastening elements. The retention tool further includes a retention plate coupled to the housing and configured to retain the fastening elements in the socket. The retention plate may have a first resistance configured to enable the insertion of the fastening elements into the socket in a first direction in response to a first application of a first force. The retention plate may also have a second resistance configured to enable the removal of the fastening elements from the socket in a second direction in response to a second application of a second force.