Johnson Level 1601-4800 48&rdquo; Eco-Tech Bamboo Level, Solid Block Acrylic Vials, Resists Mortar Adhesion, for Masonry Application and General Leveling EchoTech Level: EchoTech bamboo levels resist mortar adhesion making them the easiest cleaning level, designed for masonry work Top-Read Window: This Johnson Level bamboo level features a top-read window to maximize readability and multi-position viewing Resist Mortar Adhesion: This 48" level has EZ clean coating resists mortar adhesion so that concrete will not adhere to the surface Solid Block Vials: Solid block acrylic vials wont fog, leak or break and are hand-set to assure maximum accuracy Lifetime Accuracy Warranty: Johnson Level warrants this product against defects in material and workmanship for life. The company will replace or repair the product if it fails under normal use. Bent level frames void warranty. This warranty is limited to the repair or replacement of the product only.