These collapsible pocket magnifiers are our most popular model. The optical system is a single element, precision glass DCX lens. The housing is made of machined, black anodized aluminum for a high tech look. These magnifiers fold flat to fit in your pocket and for travel in the optional cases. Scales are etched on the inner faces of the viewer’s base (1/8," increments). The 6X scale is 0-1", 9X is 0-½".