The Welch Allyn 03400 Bulb Equivalent is a replacement lamp suited for the following 2.5v instruments:
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Otoscopes: 21110, 22820, 24031, 24011, 24020, 24000
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Illuminators/Transilluminators: 27200, 27250
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2.5v Rectal handle Adaptor: 735500
This bulb is made with halogen, which gives a whiter, brighter longer lasting light.