Technical Description for MCT-6500: Auto Refractor/Ivy and Gray Color Sphere: -20 to +20D (VD-12) 0.12 or 0.25 steps Cylinder: -8 ~ +8D 0.12 or 0.25 steps Axis: 0 ~ 180degrees, 1 degree step Pupil distance: 45 ~ 85mm, 1mm step Vertex distance: 0mm, 12mm, 13.75mm Min. Pupil size 2.2mm Chart: Auto fog Display: 5" CRT monitor Print: Thermal printer Power supply: 100 ~ 120V / 200 ~ 240 V, 50/60 Hz Dimensions: 484 (L) x 282(W) x 440(H)mm Weight: 20 kg (44 lbs.)