CRL The Edge Low-E Coating & Edge Deletion Detector provides positive identification of the coated side of glass upon direct contact with the glass surface. This tool will prove itself invaluable to insulating glass fabricators who need to verify coatings and assure correct assembly procedures using Low-E glass. With edge stops designed into the housing, there is less chance of accidental scratching in the center viewing area. Window fabricators and quality control departments can verify that no Low-E surface is inadvertently exposed. It is ergonomically designed for comfort while in your hand. Easily fits into your shirt pocket, cutter pouch, or simply add a lanyard or key-chain to the loop at the end. CR2016 battery included. Minimum order is one each. Made in the U.S.A.