ADJUSTABLE - The Kapro 340 Postrite is unique among post levels because it can be collapsed either by folding it closed like a book or by spreading it flat. It "clicks locked" every 15 allowing the Kapro 340 Postrite to be used on pipes or posts of any diameter. SECURE - With magnets for work on ferrous posts and pipes, and strong elastic straps for attaching to wood, aluminum and plastic, it is a versatile, all-purpose post level. VISIBLE - This level has 3 brightly colored cylindrical vials, including 2 horizontal and 1 vertical, to provide clear and accurate readings. COMPATIBLE - The Kapro 340 Postrite fits most standard posts, pipes, and signs and can be used in plumbing, sign installation, post leveling, and fence building. KAPRO - We reimagine precision tools and accessories for professional craftsmen to weekend warriors while setting high standards by driving innovation in our designs.