LuxaScope Ophthalmoscope LED 2.5 V White & Lilacdirect ophthalmoscope in pocket size refraction balance: + 20 bis 20 D ( 1 2 3 4 6 8 10 15 20 D) 5 different apertures: Fadenkreuz, large circle, small circle, semicircle, green filter illumination: LED can be dimmed for an individual glare free brightness automatic switchoff after 3 minutes life expectancy of LEDs: approx. 50. 000 hours by constant current drive colour temperature: approx. 4. 200 K optimized design of head two component handle