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 ... stepsVertex Distance0mm,12mm,13.75mmMin.Pupil SizeØ2.0mmChartAuto fogDisplay7"color LCDPrintThermal PrinterPower Supply100~120v/200~240v,50/60HzDimensions484(L)× ...