High resolution,better image quality Flip open hairpin tungsten cathode,easy to replace filament Chinese and English operation menu with one-click image view function Automatic function: electron gun heating, biasing, alignment, focus, brightness, contrast, astigmation Auto calibration and malfunction detection Low maintenance cost English interface, with one key imaging function Automatic adjustment function: electron gun heating, bias, alignment, focus, brightness, contrast, dissipate degree, astigmatism and other memories Low maintenance and repair costs