The Johnson extendable plate level with a heavy-duty aluminum frame is intended for the professional user. It has the accuracy and durability the jobsite demands. Providing accuracy of 0.029 deg or 0.5 mm/m and that accuracy is backed by a lifetime assurance. The center vial is hi-visibility, impact-resistant block vials and the plumb vial is positioned at eye level for easy viewing. The locking system provides protection against pinch points. The extendable arm has measuring scale on both sides for fast setup and positioning and the level is equipped with ergonomic soft touch dual handle grips.