Auto Lens Meter Specification Color LCD display screen: Measurement results and setting image can be displayed on a easy-to-view color screen. Sphere measuring range -25 - +25D unit0.010.120.25D steps Cylinder measuring range -9.99- +9.99D unit0.010.120.25D steps Axis measuring range 0°- 180° unit1° steps Add measuring range 0- +9.99D unit0.010.120.25D Prism measuring range 0 - 6 unit0.010.120.25 PD measuring range40-86mm unit0.5mm Print Build in thermal printer Power supply AC100-120(V)200-240(V) 5060HZ