... (AL): 16-40mmMeasuring parameter: Anterior chamber depth, lens thickness, vitreous length and axial lengthMeasuring method: Automatic (for normal, aphakic, pseudophakic, cataract ... ± 11%, 50Hz (or on demand in advance)Dimensions(mm): 360 x 300 x 260Weight: 10kg Ultrasonic A-B Scan for Ophthalmology