If you are a professional carpenter, or a tool-nut that has to have the greatest, then the Plumb-It PIX 4.0 will be one of your most reliable tools. This level has the ability to extend from 51" to 10'8" and has been built to exacting standards. This level has built in 1" offsets to allow for point to point or top to bottom plate readings instantly. The other great thing about PIX levels is that they are factory set for life and never need adjusting. Don't let another high wall shame you again.