auto refractormeter 1.7'' LCD colorful display 2.faster and accurate measurement 3.top-grade,CE,ISO, FDA 4.NEW model V-815 auto refractometer with LCD colurful display , New ModelSpecifications: Measuring RangeSphere -20~+20D(VD=12)0.125DstepsCylinder -8~+8D 0.12D/0.25D stepsAxis 0~180°,1°stepsPupil Distance45~85mm,1mm stepsVertex Distance0mm,12mm,13.75mmMin.Pupil SizeØ2.0mmChartAuto fogDisplay7" ...