Lightweight and Composite Construction: The use of special acrylic and ABS materials, so that it is as sharp as crystal, the horizontal direction at a glance.With molded hooks to allow the level to be hanging from a builders line.Can be used with a hanging spirit level, suitable for masonry, plumbing, gutters and tiling. Work Beautiful Finish: The string line level is made with a fine finish, practical and extremely beautiful. 360 accurate listers, easy to use. High visibility liquids provide clear readings, for fast and accurate reading. Light weight for portability. Point of Use: Placed at the contour line of the measured body, the center bubble is horizontal.The perfect tool for beginners and professionals alike when the laser level just fails to cut it.The highly visible coating makes it easy to check your line even on the sunniest days Make it easy to level your patio or finalize a job to make sure it's level or lightly leveled to provide better drainage. Applicable environment: This Hanging Line Post Leveler can be used for calibration of various frames, cross frames, art frames and wall paintings, to determine the level or parallel, and other applications.