Abstract: A tool for use in the testing of railroad relays allows for the uninterrupted completion of an electric circuit while performing a mechanical operation. The device provides an electrical connection point at a midpoint of a driver shaft. The connection point is used to connect a voltmeter or similar measuring instrument lead. The connection point utilizes a copper brush mechanism to keep constant electrical contact with the shaft even when turning. The connection point is held in place by a pair of retaining washers. These features allow a user to perform electrical readings through the driver while using the driver to perform mechanical adjustments.