Features: 1) Easy to use control functions, conveniently located below the screen 2) Quick, accurate and easy operation for alignment and measurement 3) Measures all types of lenses of all kinds of materials 4) Able to measure single vision, bifocal and progressive lenses 5) Pupil distance measurement 6) Chinese or English digital display selectable 7) Auto power saving mode 8) Thermal printer (optional) 9) Optional ultra violet transmission check (optional)