The Johnson Level H1348 48-inch Top-Reading Aluminum Level has quik-change replaceable cover plates and vials for in the field service. The rigid aluminum frame of the Johnson Level H1348 makes the level durable and accurate. Features: * Impact resistant acrylic vials assure accuracy * Screen printed rule on one leveling surface * Shock absorbing end caps protect frame * Top read window for easy readings What"s In The Box: * Johnson Level H1348 48-inch Top-Reading Aluminum Level