... color display. 2.Pupil distance auto measured available. 3.New compact design Auto refractometer 1,Adopt ARM process and ... 5.7"LCD color display.5,Pupil distance auto measured available.6,New compact design enchances ... with external machines,such as computerized vision tester and auto projector. Specifications Measurement RangeSphere -20D~+20D (VD= ... -232Power Save:5/10 min(Selectable) Auto refractometer