Welch Allyn 3.5V Fiber Optic Transilluminators Each 41102 by Welch Allyn GROUP: Equipment & Furniture:Lighting:Specialty Item Description: Accessories: Cobalt Blue Filter Only Packaging Desc: Filter Cobalt Blu Country of Origin: Harmonized Tariff Code: Product Description: These instruments use halogen illumination transmitted through fiber optics for brilliant, yet cool illumination. Fits any Welch Allyn 3.5V power source. May be sterilized by steam, gas, or some germicidal solutions.