It is also the correct replacement bulb for the following microscope models no longer sold:

This bulb is compatible with the Home Science Tools 20/40x and 10/30x stereo microscope models with tungsten lighting. If your HST 20/40x or 10/30x microscope does not use tungsten lighting, order the halogen bulb as a replacement.

Note: If you're unsure which replacement bulb to buy, take out your current microscope bulb and match it to the photos on our website.