Specifications:   
Measuring methor: Placido cone  
Coverage: 0.25mm-11mm(Diameter)  
Measuring range for curvature redius: 6.35mm-9.53mm  
Field of view: 11mm H x 11mm V  
Illumination source: cone      760nm red LED  
 profile    non-visible infrared 950nm red LED  
 fixation  530nm green LED  
Diopter range: 28.0-65.5D  
Piacido rings: 32 rings  
Measurement points: 11520  
Calibration ball: R 7.9375mm±0.001mm  
Output: Optional printer  
Weight: 5Kg  
Size: 36*38*45mm