... sense, Distinct gradations, Wide view, GY-2200B Colposcope Digital Imaging System(1) Optical system is five gears ,zoom ,and focus, Strong ... sense, Distinct gradations, Wide view, (2) In the Optical Ocular has a ruler, it can measure the size of ... dimensional imaging, and all the different levels diseased region tissue can gain the best observation effect. GY-2200B Colposcope Digital Imaging System