Features here is a handheld auto-refract keratometer. The battery able to measure continuously 220 minutes. With view finder observation, no limit operator age. Diopter adjustable range is ＋/－8D the same as Retinomax3.

• Pupil size measurement : 2.0 to 12.0 mm (in 0.1 mm increment)
• Vertex distance: 0, 12mm adjustable
• Pupil size measurement time: +0.27 sec./1 time
• Measurement mode: Auto/Continuous/Auto Quick/Quick
• IOL wearing eye: Automatic support
• Fixation target: picture target
• Measurement range: spherical(S+C): -20.00D to +23.00D(in 0.25D increment)