92821 Welch Allyn 2.5 V Pocketscope Diagnostic Set92821 Welch Allyn 2. 5 V Pocketscope Diagnostic Set Welch Allyn PocketScope 2. 5 V Halogen Diagnostic Set including Ophthalmoscope (#13000), Otoscope (#21111), 2 PocketScope Handles (72830) w AA Batteries, Soft Storage Case Welch Allyn PocketScope diagnostic sets are lightweight, compact diagnostic instruments for those who want high performance in a slightly smaller package. Welch Allyn PocketScopes feature superior halogen illumination and rheostat