Skillbuildersä Bi Height Wedge 18 x 22 Height: 4 or 6 Toe Crests * Second height knob removes Otoscope Accessory * Second height knob removes side to side play Our Coaxial Ophthalmoscope uses a Halogen HPX lamp that provides 30% more light output for true tissue color and consistent long lasting illumination * 28 lenses from 25 to +40 diopters for better resolution * The coaxial optical system produces a shadow free spot and easier entry into undilated pupils * The crossed linear polarizing filter reduces corneal reflection * The red free filter may be used with any aperture * It has 18 possible aperture combinations for greater versatility * Otoscope uses Halogen HPX lamp and fiber optics for cool light with no reflections no obstruction * It comes with a wide angle viewing lens for instrumentation under magnification * The Lithium Ion Handle is just half the weight of current 3 Position at a higher or lower height (use on side 1 or side 2) * Without the removable straps the deluxe wedge functions just like the standard Skillbuilders© wedge *