Direct ophthalmoscope a classic medical device for ophthalmology adopts a professional lens system.It makes doctors conveniently get a clear visual field and examine the interior structures of eyes. Tech Specs:LED White Buld and LED Sunlight Bulb.B-BP101 LED White or V-BP102 LED SunlightRange of lenses: -20D to +20DBattery: 2AA Alkaline Batteries
