ProTools Reviews calls it “one of the best extension ladders we’ve ever seen.” The Little Giant SumoStance 24-foot ladder has a lever that releases a stable base.
Two bubble levels are built-in to the ladder: one is to make sure users are climbing the ladder as if on perfectly even ground; the other ensures users are at the correct OSHA-required angle to the vertical surface the ladder is leaning on.
Read more at ProTool Reviews.