Ensures surfaces are evenly horizontal and vertical Levels three ways at the same time: horizontal, vertical and surface Use the bubble as a leveling guide When the bubble is perfectly centered between the lines, that means the surface is level Dimensions: 1-3/4' x 1-3/4' RV Designer E403 Bubble Level - Pocket, 1-3/4' x 1-3/4' SKU: 1023.2935 UPC: 601320984034