Dino lite usb digital hand held microscopes long working distance high speed dino lite ad3713ztl digital hand held microscopes that feature a long working distance and high video refresh rate the long working distance makes it easy to work in or around the object eg for precision assembly or repair the high 60fps video refresh rate means that instant live imaging is possible the 03megapixel colour cmos sensor gives sharp accurate images and 8x white leds used for object illumination g