Abstract: A mechanical press for testing printed circuit boards in conjunction with a conventional probe card testing assembly is presented. A press assembly attached to a press mount mounted over the probe card testing assembly includes a movable frame including a plate that is height-adjustable relative the movable frame and a plurality of synchronized force-applying members that are actuatable to extend the plate downward a predetermined distance with equal downward pressure across the plate. The plate is height-adjustable within the movable frame via four elongated rotatable screws that protrude through the upper surface of the press mount in order to moveably support the press assembly. Each screw has a timing belt pulley for synchronous power transmission disposed above the stationary frame upper surface. A timing belt or similar continuous belt or chain engages each belt pulley, thereby synchronizing the rotation of the screws.