JLT1023 Features: * Top-read aluminum level * Heavy duty aluminum frame assures accuracy * Top read windows simplifies viewing the level vial in horizontal applications * Quik-change vial easily fits into the precision-stamped cutout in the frame * Plastic vial covers with clear acrylic lenses screw into place for easy vial access and replacement * Quik-change replaceable vial covers * Top-read window maximizes readability * Durable acrylic vials are impact resistant * Shock absorbing end caps protect frame Dimensions: * Dimensions: 18"" H x 2.25"" W x 1"" D