Welch Allyn 2.5v PocketScope Set with Ophthalmoscope Otoscope AA Batteries Soft Case 2.5V PocketScope Ophthalmoscope uses halogen illumination for true tissue color and consistent, long lasting illumination. It has 6 aperture selections for general and specialist use, and 48 lenses for better resolution. 2.5V Otoscope also has built in throat illuminator - two in one instrument! Features halogen illumination and fiber optics for a cool light with no reflections or obstructions, plus a rectangular viewing lens for instrumentation under magnification. 2.5V PocketScope handle has a smooth rheostat to control light intensity and features a handy pocket clip. .