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