Exposure meter
device · 1931 · Electric age
A light meter for photography.
What it is made of
- Photodiode — has part. A photocell.
Principles and materials it uses
- Semiconductor — is made of. The sensor is a selenium photocell.
Where it is used
- Camera — is part of. A built-in light meter.
What it is a kind of
- Photometer — is a kind of. A photometer.