Intuitive color LCD touch screen The 5.7-inch color LCD touch screen displays all data with high visibility. Simple, understandable, and comfortable user interfaces ensure an effective operation. Jog dial with S/C/A mode key The jog dial on the control box provides smooth operation. The S/C/A mode key on the center of dial allows the operator to quickly change sphere, cylinder and axis powers using only one hand. Built-in High Speed Line Printer The RT-3100's control box includes a built-in, high-speed printer. It automatically prints out the measured results, and the data is simply laid out so that operator can easily explain to patients. Replacing the paper is totally effortless and takes only a few seconds. Features Smooth, quick, silent lens selection R/L independent PD adjustment for improved precision Clear, white LED illumination High quality near point card