The 4T traces both lenses for accurate DBL. A 2,000 point resolution encoder, as well as 3D tracing, which ensures highly accurate reproduction. The Optronics 4T is ideal for all tracing environments and designed for tracing a wide range of frame styles and curves. The 4T Provides the operator with traced shape image and ability to input data in a compact design. The 4T simplifies loading and avoids shape distortion. It also eliminates the risk of debris damaging key electrical components. The Nation Optrnics 4T modifies traced shapes with editing tools to create custom shape designs.