Some products are better illustrated with video. When I came across the Stringa-Level web site, I found this: "The system is comprised of interlocking sections with level vials that are used in series to form a continuous angle support shelf on which the first course of tile rests." Come again? I didn't develop an appreciation for this product until I saw the video. If you are in the business of installing tile, this might be the product for you. The pieces in Stringa-Level lock together to form a level line that will support the installation of tile around corners and above the floor. It's difficult to explain, so watch the video.
When ever i set wall tile the hardest part isnt making each tile level its keeping them all level while you set the tiles down the row. This product works great, saves time and a few grey hairs.