Physics
Millikan LED Light Source
LED Light Source with adjustable brightness control, for use with Millikan Oil Drop Apparatus.
You can use the Millikan LED (light emitting diode) Light Source to replace the Light Source Assembly on the Millikan Oil Drop Apparatus. The Millikan LED Light Source is brighter than the light source on the Apparatus, and the brightness of the LED Light Source is adjustable. The very long expected life span of the LED means that the LED Light Source should never need replacement.
https://www.pasco.com/products/lab-apparatus/fundamental-constants/ap-8212#specs-panel