
The Bulb Holder by United Scientific is a bulb holder that mounts a lamp on the meter stick to serve as the light source for optics experiments. Designed for the United Scientific Meter Stick Optical Bench and stated to fit any standard meter stick, it lets physics teachers build a custom bench or replace lost and damaged parts. Sold 1 each, it is used in high school and introductory physics classes for lens and image-formation experiments.