All metal BACKBONE - strongest, most durable frame, reinforced vial retention SHARPSITE vial technology best readability, impact protected High contrast vial system is easy to clean and optimizes visibility High density, removable end caps protect frame and provide access in tight spaces Wide, durable handles for comfort and portability Precision milled measuring surface guarantees accuracy in all working positions Overmolded, non-slip grips stick to the wall and prevent sliding