Auto Refracto-Keratometer ARK-4000   Corneal apex distance 0.0, 12.0, 13.75, 15.0 Spherical mirror degree -20.00D ~ 20.00D (VD = 12mm, 0.01, 0.06, 0.12, 0.25 units) Cylindrical power 0.00D ~ 10.00D (0.06, 0.12, 0.25 units) Axis position 10 ~ 180 ° (1 ° unit) Astigmatism symbol -, , ± Interpupillary distance 10 ~ 86mm Minimum pupil diameter 2.0mm Measurement completion time <0.5 seconds Pupil diameter 2.00-8.00mm Measure light energy <30uw (ensure measurement safety Cornea curvature radius 5.0 ~ 10.0mm (0.01mm accuracy) Cornea diopter 33.00D ~ 67.0D (when the corneal equivalent diopter is 1.3375) Corneal astigmatism 0.00D-15.00D (0.06D / 0.12D / 0 25D units) Stored data 10 measurements each Axis position 1 ° ~ 180 ° Visual target Guided cloud map Display 8-inch TFT touch screen (adjustable viewing angle) Printer 57mm thermal printer Power supply AC 100 ~ 250V, 50 / 60Hz, wide power supply Net weight 22 kg Gross weight 26.5 kg Packing size (length) 680mm x (width) 400mm x (height) 640mm