The Weston 603 was first release in 1931 and is the first known photovoltaic cell powered device. It used a pair of Weston 594 selenium cells to power a meter for measuring room illumination. Unit pictured is a later model from 1941.
| Company | Weston |
| Year | 1931 |
| Cell Type | Instrument, Selenium |
| Part No. | 603 |
| Primary Use | Commercial, |
| Materials | Wood, Iron, Selenium, Glass, Bakelite |
| Acquisition | Purchased |
