How come they don't make selenium meters anymore?

[tkamiya]

I think it's simply a demand thing.

People wants sophisticated microprocessor controlled and LCD display kind. You can average, min and max, dynamic range alert, etc, etc, etc with a click of a button. (and menu...) Sekonic makes a selenium kind and another one that is similarly simple. So they are there. It'll be interesting to find out how many of those they sell, and how many people who buy those upgrades to more sophisticated models later.

It's probably cheaper to use photo diode also as they are mass produced in far greater number than selenium cells. Knowing you can buy a small LCD clocks for a dollar or so and a mechanical meter (the assembly with a needle and scale) usually cost more, production cost may be lower on photo diode with LCD kind than selenium with a traditional needle meter kind.

All guesses on costs, but being in electronics field before, I have a pretty good idea of what it takes to manufacture these things. Anyway, that's what I think.

 

[Roger Cole]

and even common table salt is said to contain chlorine which was used in WW I as poison gas.

Well not really - it doesn't "contain" chlorine any more than water "contains" hydrogen. When elements combine to form compounds you get an entirely different substance.

But I agree that as such things go there is far worse than selenium still being used in various applications.


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