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Old light meter.
An example of the element Selenium

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Old light meter.
This is one of a batch of three old photographer's light meters I got on eBay: From the paperwork that came with them, it looks like people sent them in for repair at a certain shop, paid for the repairs, but never claimed the meters. That was 30 years ago, so I guess the shop can be forgiven for giving up hope on them.
The neat thing about selenium light meters is that they require no batteries: The selenium sensor works like a photocell to generate its own electricity. This meter, having been repaired only 30 years ago, works perfectly.
Source: eBay seller beaglemania2
Contributor: Theodore Gray
Acquired: 15 August, 2003
Price: $7
Size: 4"
Purity: <10%
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