19-inch TFT LCD    
Measuring distance: 2.5~6.0mm    
Standard meansuring charts:    
Letters; Children; Number; Tumbling E; Landolt C; Red-green Bilindness; Contrast sensitivity; Red / Green;    
Worth For DOT; Minute Stereo; Schober; Cross; Fixation; Cross grid; Beehive; Astigmatic Clock Dial    
Masking:    
Horizontal line; Vertical line; Single letter    
Dimensions:    
Main machine: 50cm*38cm*55.5cm    
Power consumption: 85W    
Power source: AC220-240v, AC110v-12v, 50/60Hz