UPGRADE YOUR DEVICE TO LED! | Also Known As: WA03100-U, WA-03100U , WA3100-U , WA3100, 03100-U, 03100U , 3100U , 03100-U | Lamps are used in the following instruments: Otoscopes-20000,25020,21700,20200,20202,25000 & 25200 3.5v Handle Adapter-73500 Tongue Blade Holder-28100 | Also used in Also used in Retinoscope-Illiminators & Transilluminators-27000,27050,26530,41100,43300 & 26500 | This Premium Quality Replacement lamp is Manufactured by Starlighting and is Guaranteed to Meet or Exceed the Original Manufacturers Specifications. The use of the Original Manufacturers Name is for Identification purposes only. The name Welch Allyn is trademarked and wholly owned by Welch Allyn. We do not sell or distribute Welch Allyn Products